Double HandedClub Certificate2025
StærNOR 15179
Norges Seilforbund
Sognsveien 73
0854 OSLO
Rated boat velocities in knots
Wind Velocity 4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat Angles44.2°44.2°42.0°40.4°39.0°38.5°38.3°38.4°39.7°
Beat VMG2.813.874.655.065.305.445.525.585.48
52°4.465.986.987.427.617.757.837.927.91
60°4.836.367.307.707.877.988.078.178.18
75°5.156.687.557.978.228.368.468.638.71
90°5.116.657.558.048.408.688.889.149.31
110°4.456.097.297.958.378.719.129.7910.30
120°4.295.917.157.888.378.849.2210.0811.17
135°3.765.306.587.508.088.589.0810.2811.65
150°3.114.475.716.767.558.108.589.5910.99
Run VMG2.693.874.945.866.637.277.788.689.65
Gybe Angles142.6°142.6°148.0°151.9°156.5°163.5°168.2°169.6°163.1°
APH ToD:513.8CDL: 10.471APH ToT: 1.1678CertNo:666769
BOAT
ClassArcona 410DesignerStefanQuibergBuilderArcona YachtsAge date01/2014Series date01/2011Offset filearcona410.offData file666769
HULL
Length Overall12.200 mMaximum Beam3.882 mDraft2.200 mDisplacement7,945 kgDLR5.5984IMS DivisionCruiser/RacerDynamic Allowance0.180%Age Allowance0.455%
PROPELLER
InstallationStrutTypeFolding 2 bladesDiameter0.430m
CREW
Maximum weight190 kg(declared)Minimum weight120 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail53.7754.61Headsail Luffed35.7535.75Headsail Flying68.5668.56Symmetric129.47129.47Asymmetric
STORM SAIL AREAS (m²)
Trysail16.59Storm Jib13.67Heavy Weather Jib36.89
SAIL LIMITS
Headsails6Spinnakers5
STABILITY
Righting MomentN/AStability IndexN/A
The owner and any other person in charge is responsible that boat is complying with her certificate in accordance with RRS 78.1 and ORC Rule 304.
Double HandedClub Certificate2025
StærNOR 15179
Norges Seilforbund
Sognsveien 73
0854 OSLO
Time Allowances in secs/NM
Wind Velocity 4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Beat VMG1281.6931.0774.0711.8679.0661.8652.4644.8657.0
52°807.7602.4515.5485.4473.3464.8459.8454.7455.3
60°744.9565.9493.3467.4457.5451.1446.1440.5439.9
75°698.7538.9476.9451.4438.1430.7425.6417.2413.3
90°704.8541.7476.9447.9428.8414.7405.4393.8386.7
110°808.5591.1493.8452.6430.0413.2394.7367.7349.6
120°840.0608.9503.6457.0430.0407.4390.3357.2322.2
135°956.2679.3547.2479.9445.5419.7396.4350.3309.0
150°1159.2805.0631.0532.9476.5444.6419.8375.2327.5
Run VMG1338.8929.6728.6614.4542.9495.4462.6414.9373.1
Selected Courses
Windward / Leeward1309.6930.3751.3663.1610.9578.6557.5529.9515.1
All purpose976.7709.3587.1530.3498.5478.1463.4441.2426.4
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward635.50.9441
All purpose513.81.1678
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.8309
Downwind "popa"1.0028
70% up, 30% down "Ilhabela"0.8760
30% up, 70% down "Ilhabela-inverso"0.9442
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Predominantly Upwind555.21.0808
Predominantly Downwind520.31.1532
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low648.20.9256
Triple Number AP Medium511.41.1732
Triple Number AP High458.81.3079
Triple Number Windward/Leeward Low878.90.6827
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Single Number Predominant Upwind575.91.0418
Single Number Predominant Reaching505.31.1875
Single Number Predominant Downwind542.61.1058
Predominant Upwind - Low770.50.7788
Predominant Upwind - Low/Med601.10.9981
Predominant Upwind - Medium540.71.1098
Predominant Upwind - Med/High508.31.1804
Predominant Upwind - High493.41.2159
Predominant Downwind Low790.20.7593
Predominant Downwind Low/Med588.01.0205
Predominant Downwind Medium503.31.1921
Predominant Downwind Med/High448.41.3381
Predominant Downwind High413.71.4504
Predominant Reaching Low686.20.8744
Predominant Reaching Low/Med534.31.1230
Predominant Reaching Medium475.51.2618
Predominant Reaching Med/High438.41.3685
Predominant Reaching High415.41.4443
SA/DSPL Upwind22.33SA/DSPL Downwind45.71
Scoring OptionTODTOT
5-Band Windward/Leeward Low980.50.6119
5-Band Windward/Leeward Low/Med725.80.8266
5-Band Windward/Leeward Medium621.40.9655
5-Band Windward/Leeward Med/High560.91.0698
5-Band Windward/Leeward High532.11.1277
Windward/Leeward 60-40 Low980.30.6121
Windward/Leeward 60-40 Low/Med732.90.8187
Windward/Leeward 60-40 Medium634.60.9455
Windward/Leeward 60-40 Med/High579.71.0351
Windward/Leeward 60-40 High555.31.0805
5-Band AP Low714.20.8401
5-Band AP Low/Med572.01.0490
5-Band AP Medium504.81.1886
5-Band AP Med/High465.11.2901
5-Band AP High442.51.3559
5-Band SF Bay Tour - Low843.90.7110
5-Band SF Bay Tour - Low/Med693.80.8648
5-Band SF Bay Tour - Medium600.40.9993
5-Band SF Bay Tour - Med/High547.21.0966
5-Band SF Bay Tour - High520.41.1530
Chicago-Mac Upwind1.0124
Chicago-Mac All Purpose1.0435
Chicago-Mac Downwind1.0655
Bayview-Mac Cove Island0.7694
Bayview-Mac Shore0.7766
Harvest Moon Regatta442.81.3550
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance559.8
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating559.81.0717
FinRating, kevyt tuuli960.71.0409
FinRating, kova tuuli444.61.1247
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance1.0717
Triple Number Coastal/Long Distance Low0.9256
Triple Number Coastal/Long Distance Medium1.1733
Triple Number Coastal/Long Distance High1.3079
Triple Number Windward/Leeward Low0.7136
Triple Number Windward/Leeward Medium0.9495
Triple Number Windward/Leeward High1.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
For information
General Purpose Handicap (GPH)574.2
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low648.2
Triple Number Coastal/Long Distance Medium511.4
Triple Number Coastal/Long Distance High458.8
Triple Number Windward/Leeward Low840.8
Triple Number Windward/Leeward Medium631.9
Triple Number Windward/Leeward High552.4
Predominantly Upwind555.2
Predominantly Downwind520.3
Predominantly Reaching496.5
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9256
Triple Number Coastal/Long Distance Medium1.1733
Triple Number Coastal/Long Distance High1.3079
Triple Number Windward/Leeward Low0.7136
Triple Number Windward/Leeward Medium0.9495
Triple Number Windward/Leeward High1.0862
Coastal/Long Distance1.0717
Predominantly Upwind1.0808
Predominantly Downwind1.1532
For information
General Purpose Handicap (GPH)574.2
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.1678
Distanseseilas Trippeltall svak vind0.9256
Distanseseilas Trippeltall mellomvind1.1733
Distanseseilas Trippeltall sterk vind1.3079
Pølsebane Trippeltall svak vind0.7136
Pølsebane Trippeltall mellomvind0.9495
Pølsebane Trippeltall sterk vind1.0862
Motvind Singeltall1.0808
Medvind Singeltall1.1532
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Coastal/Long Distance559.81.0717
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind555.21.0808
Predominantly Downwind520.31.1532
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore519.51.1549
Cape Doctor Coastal430.91.3925
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9256
Triple Number Coastal/Long Distance Medium1.1733
Triple Number Coastal/Long Distance High1.3079
Triple Number Windward/Leeward Low0.7136
Triple Number Windward/Leeward Medium0.9495
Triple Number Windward/Leeward High1.0862
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9256
Triple Number Coastal/Long Distance Medium1.1733
Triple Number Coastal/Long Distance High1.3079
Triple Number Windward/Leeward Low0.7136
Triple Number Windward/Leeward Medium0.9495
Triple Number Windward/Leeward High1.0862
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Predominantly Upwind555.21.0808
Predominantly Downwind520.31.1532
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance559.81.0717
Triple Number Coastal/Long Distance Low648.20.9256
Triple Number Coastal/Long Distance Medium511.41.1733
Triple Number Coastal/Long Distance High458.81.3079
Triple Number Windward/Leeward Low840.80.7136
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1397.3930.2706.3597.4532.6496.1467.8421.7403.6
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low648.20.9256
Triple Number AP Medium511.41.1732
Triple Number AP High458.81.3079
Triple Number Windward/Leeward Low878.90.6827
Triple Number Windward/Leeward Medium631.90.9495
Triple Number Windward/Leeward High552.41.0862
Single Number Predominant Upwind575.91.0418
Single Number Predominant Reaching505.31.1875
Single Number Predominant Downwind542.61.1058
Predominant Upwind - Low770.50.7788
Predominant Upwind - Low/Med601.10.9981
Predominant Upwind - Medium540.71.1098
Predominant Upwind - Med/High508.31.1804
Predominant Upwind - High493.41.2159
Predominant Downwind Low790.20.7593
Predominant Downwind Low/Med588.01.0205
Predominant Downwind Medium503.31.1921
Predominant Downwind Med/High448.41.3381
Predominant Downwind High413.71.4504
Predominant Reaching Low686.20.8744
Predominant Reaching Low/Med534.31.1230
Predominant Reaching Medium475.51.2618
Predominant Reaching Med/High438.41.3685
Predominant Reaching High415.41.4443
SA/DSPL Upwind22.33SA/DSPL Downwind45.71
Scoring OptionTODTOT
5-Band Windward/Leeward Low980.50.6119
5-Band Windward/Leeward Low/Med725.80.8266
5-Band Windward/Leeward Medium621.40.9655
5-Band Windward/Leeward Med/High560.91.0698
5-Band Windward/Leeward High532.11.1277
Windward/Leeward 60-40 Low980.30.6121
Windward/Leeward 60-40 Low/Med732.90.8187
Windward/Leeward 60-40 Medium634.60.9455
Windward/Leeward 60-40 Med/High579.71.0351
Windward/Leeward 60-40 High555.31.0805
5-Band AP Low714.20.8401
5-Band AP Low/Med572.01.0490
5-Band AP Medium504.81.1886
5-Band AP Med/High465.11.2901
5-Band AP High442.51.3559
5-Band SF Bay Tour - Low843.90.7110
5-Band SF Bay Tour - Low/Med693.80.8648
5-Band SF Bay Tour - Medium600.40.9993
5-Band SF Bay Tour - Med/High547.21.0966
5-Band SF Bay Tour - High520.41.1530
Chicago-Mac Upwind1.0124
Chicago-Mac All Purpose1.0435
Chicago-Mac Downwind1.0655
Bayview-Mac Cove Island0.7694
Bayview-Mac Shore0.7766
Harvest Moon Regatta442.81.3550
Double HandedClub Certificate2025
StærNOR 15179
Norges Seilforbund
Sognsveien 73
0854 OSLO
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassArcona 410MeasurementHINPlan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA12.200Max. Beam3.882Draft2.200Displacement7,945Wetted area33.12IMS L11.269LSM011.236Acc. length12.200Sink (kg/mm) 26.29
VCGD-0.110VCGM-0.036RM Rated (kg·m) 256.0Limit of positive stability(°) N/AStability IndexN/ADefault crew weight170Declared crew weight190
PROPELLER
Propeller TypeFolding 2 blades
InstallationStrutTwin screwNoHydro generatorNo
PRD0.430PBWPIPA0.0040
EDL1.800ST10.070ST20.180
ST30.180ST40.110ST50.300
RIG
Forestay tensionAftInner stayNone FittedMast materialAluminumSingle headsail furlerNoMainsail furlerArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays0CheckstaysSpreaders2Rotating mastNo
P16.200IG16.530ISP17.740MDT10.110MDL10.230MDT20.110MDL20.170TL2.750MW0.000GO0.000
E5.850J4.610BAS1.660FSDFoilSFJ0.000SPL5.192WPLTPS4.610BD0.000MWT0.00MCG0.000
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.110Flotation Date01/01/2015
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Double HandedClub Certificate2025
StærNOR 15179
Norges Seilforbund
Sognsveien 73
0854 OSLO
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment625-2024031913150.151.081.983.524.7753.7719/03/2024
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment466-2015041011400.051.062.124.216.107.8716.81NoYes068.5610/04/2015625-2024031913170.060.531.042.133.354.6016.11YesNo 35.7519/03/2024
SYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLAreaMeas.DateComment466-20140715173117.8517.8517.858.758.52129.4715/07/2014330-20171221112117.2017.2017.207.988.10114.7221/12/2017Aktiv
CRUISER/RACER REQUIREMENTS*
Accommodation length12.2 mTable area0.55 m²Headroom1.82 mMinimum number of berths5Personal gear stowage0.20 m³Fresh water capacity155 lMinimum number of seats in cockpit5Food stowage0.30 m³Fuel capacity94 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.