Club Certificate2025
SERENADEJPN 5960
ORC
Central Rating Office
Issuing certificates for
UNITED KINGDOM
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 Angles45.2°45.2°43.1°41.8°40.7°39.6°38.9°38.1°37.9°
Beat VMG2.523.564.435.115.666.036.256.476.55
52°4.025.546.747.638.248.618.829.039.12
60°4.365.927.087.948.488.819.039.279.38
75°4.586.177.328.158.668.999.249.599.81
90°4.506.257.648.538.989.219.389.7410.11
110°4.676.487.918.799.289.649.9710.3910.77
120°4.576.367.798.709.239.6510.0310.7711.33
135°3.835.597.158.228.899.369.7910.6411.66
150°3.284.675.957.198.168.779.199.9110.66
Run VMG2.844.055.156.227.077.648.078.809.41
Gybe Angles141.9°141.9°145.8°144.7°150.7°152.8°156.5°162.5°161.9°
APH ToD:484.9CDL: 12.861APH ToT: 1.2374CertNo:110703
BOAT
ClassSWAN 54DesignerG. FRERSBuilderNAUTORAge date01/2016Series date01/2004Offset fileSWN54.offData file54-006
HULL
Length Overall16.443 mMaximum Beam4.736 mDraft2.445 mDisplacement22,001 kgDLR7.2726IMS DivisionCruiser/RacerDynamic Allowance0.410%Age Allowance0.487%
PROPELLER
InstallationShaft exposedTypeFolding 3 bladesDiameter0.620m
CREW
Maximum weight1,165 kg(default)Minimum weight990 kg ✱ when appliedNon Manual PowerNoCrew Arm Extension
SAIL AREAS (m²)
MeasuredRatedMainsail78.0579.49Headsail Luffed65.6165.61Headsail FlyingSymmetricAsymmetric263.85263.85 (All asymmetric spinnakers with SHW/SFL > 85%)
STORM SAIL AREAS (m²)
Trysail23.58Storm Jib22.44Heavy Weather Jib60.58
SAIL LIMITS
Headsails7
✱ Woven polyester sails
Spinnakers5
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.
Club Certificate2025
SERENADEJPN 5960
ORC
Central Rating Office
Issuing certificates for
UNITED KINGDOM
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 VMG1428.91011.8811.8704.0636.5596.9575.8556.1549.6
52°894.5649.3534.2472.0436.7418.3407.9398.5394.7
60°825.8608.3508.2453.5424.4408.4398.8388.2383.8
75°786.0583.8492.0441.9415.6400.3389.7375.4366.9
90°800.9576.2471.4422.1400.8391.0383.8369.7356.2
110°771.1555.3455.4409.6388.0373.3361.2346.5334.4
120°788.1566.0462.4413.6389.9373.0358.8334.3317.9
135°940.2644.6503.6438.2404.9384.6367.8338.3308.7
150°1098.0770.1605.3500.9441.4410.3391.6363.2337.9
Run VMG1267.8889.2698.9578.4509.4471.4445.9409.2382.4
Selected Courses
Windward / Leeward1348.5950.5755.3641.2572.9534.1510.9482.7466.0
All purpose1016.7723.8583.0506.2463.3438.8423.0402.6388.6
Single Number Scoring Options
CourseTime On
Distance
Time On
Time
Windward / Leeward605.20.9914
All purpose484.91.2374
 
Custom scoring options for Australia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Custom scoring options for Austria
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Brazil
Scoring OptionTime On
Time
Upwind "bolina"0.8584
Downwind "popa"1.0494
70% up, 30% down "Ilhabela"0.9080
30% up, 70% down "Ilhabela-inverso"0.9837
Custom scoring options for Bulgaria
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Predominantly Upwind529.31.1336
Predominantly Downwind491.81.2201
Custom scoring options for Canada
Scoring OptionTODTOT
Triple Number AP Low653.40.9183
Triple Number AP Medium481.51.2461
Triple Number AP High419.31.4309
Triple Number Windward/Leeward Low891.10.6734
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Single Number Predominant Upwind554.21.0826
Single Number Predominant Reaching483.41.2413
Single Number Predominant Downwind516.01.1629
Predominant Upwind - Low813.90.7371
Predominant Upwind - Low/Med598.71.0021
Predominant Upwind - Medium508.01.1811
Predominant Upwind - Med/High459.61.3053
Predominant Upwind - High440.11.3634
Predominant Downwind Low783.10.7662
Predominant Downwind Low/Med563.21.0653
Predominant Downwind Medium470.21.2760
Predominant Downwind Med/High418.41.4339
Predominant Downwind High390.61.5361
Predominant Reaching Low704.60.8516
Predominant Reaching Low/Med518.11.1581
Predominant Reaching Medium444.31.3504
Predominant Reaching Med/High405.51.4796
Predominant Reaching High384.71.5596
SA/DSPL Upwind18.11SA/DSPL Downwind43.10
Scoring OptionTODTOT
5-Band Windward/Leeward Low1001.20.5993
5-Band Windward/Leeward Low/Med716.90.8369
5-Band Windward/Leeward Medium587.91.0207
5-Band Windward/Leeward Med/High515.21.1645
5-Band Windward/Leeward High484.71.2380
Windward/Leeward 60-40 Low1014.20.5916
Windward/Leeward 60-40 Low/Med729.00.8230
Windward/Leeward 60-40 Medium600.40.9993
Windward/Leeward 60-40 Med/High528.41.1355
Windward/Leeward 60-40 High499.41.2014
5-Band AP Low721.30.8318
5-Band AP Low/Med559.01.0734
5-Band AP Medium472.91.2687
5-Band AP Med/High425.61.4097
5-Band AP High403.71.4862
5-Band SF Bay Tour - Low861.50.6964
5-Band SF Bay Tour - Low/Med684.60.8764
5-Band SF Bay Tour - Medium565.61.0607
5-Band SF Bay Tour - Med/High499.11.2022
5-Band SF Bay Tour - High470.81.2743
Chicago-Mac Upwind1.0400
Chicago-Mac All Purpose1.0818
Chicago-Mac Downwind1.1173
Bayview-Mac Cove Island0.7644
Bayview-Mac Shore0.7688
Harvest Moon Regatta417.01.4390
Custom scoring options for Cyprus
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Denmark
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Spain
Scoring OptionTime On
Distance
Coastal/Long Distance531.5
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Estonia
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Custom scoring options for Finland
Scoring OptionTime On
Distance
Time On
Time
FinRating531.51.1290
FinRating, kevyt tuuli979.41.0210
FinRating, kova tuuli406.61.2297
Custom scoring options for France
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Custom scoring options for Germany
Scoring OptionTime On
Time
Coastal/Long Distance1.1290
Triple Number Coastal/Long Distance Low0.9183
Triple Number Coastal/Long Distance Medium1.2463
Triple Number Coastal/Long Distance High1.4309
Triple Number Windward/Leeward Low0.7035
Triple Number Windward/Leeward Medium0.9980
Triple Number Windward/Leeward High1.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
For information
General Purpose Handicap (GPH)550.4
Custom scoring options for Greece
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Hungary
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Custom scoring options for Israel
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Japan
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Korea
Scoring OptionTime On
Distance
Triple Number Coastal/Long Distance Low653.4
Triple Number Coastal/Long Distance Medium481.4
Triple Number Coastal/Long Distance High419.3
Triple Number Windward/Leeward Low852.9
Triple Number Windward/Leeward Medium601.2
Triple Number Windward/Leeward High506.1
Predominantly Upwind529.3
Predominantly Downwind491.8
Predominantly Reaching469.6
Custom scoring options for Lithuania
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Netherlands
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9183
Triple Number Coastal/Long Distance Medium1.2463
Triple Number Coastal/Long Distance High1.4309
Triple Number Windward/Leeward Low0.7035
Triple Number Windward/Leeward Medium0.9980
Triple Number Windward/Leeward High1.1855
Coastal/Long Distance1.1290
Predominantly Upwind1.1336
Predominantly Downwind1.2201
For information
General Purpose Handicap (GPH)550.4
Custom scoring options for Norway
Scoring OptionTime On
Time
Distanseseilas Singeltall  (APH)1.2374
Distanseseilas Trippeltall svak vind0.9183
Distanseseilas Trippeltall mellomvind1.2463
Distanseseilas Trippeltall sterk vind1.4309
Pølsebane Trippeltall svak vind0.7035
Pølsebane Trippeltall mellomvind0.9980
Pølsebane Trippeltall sterk vind1.1855
Motvind Singeltall1.1336
Medvind Singeltall1.2201
Custom scoring options for Portugal
Scoring OptionTime On
Distance
Time On
Time
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Coastal/Long Distance531.51.1290
Custom scoring options for Russia
Scoring OptionTime On
Distance
Time On
Time
Predominantly Upwind529.31.1336
Predominantly Downwind491.81.2201
Custom scoring options for South Africa
Scoring OptionTime On
Distance
Time On
Time
Cape Doctor Inshore471.01.2739
Cape Doctor Coastal392.81.5274
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Custom scoring options for Slovenia
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9183
Triple Number Coastal/Long Distance Medium1.2463
Triple Number Coastal/Long Distance High1.4309
Triple Number Windward/Leeward Low0.7035
Triple Number Windward/Leeward Medium0.9980
Triple Number Windward/Leeward High1.1855
Custom scoring options for Switzerland
Scoring OptionTime On
Time
Triple Number Coastal/Long Distance Low0.9183
Triple Number Coastal/Long Distance Medium1.2463
Triple Number Coastal/Long Distance High1.4309
Triple Number Windward/Leeward Low0.7035
Triple Number Windward/Leeward Medium0.9980
Triple Number Windward/Leeward High1.1855
Custom scoring options for Sweden
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Predominantly Upwind529.31.1336
Predominantly Downwind491.81.2201
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for Ukraine
Scoring OptionTime On
Distance
Time On
Time
Coastal/Long Distance531.51.1290
Triple Number Coastal/Long Distance Low653.40.9183
Triple Number Coastal/Long Distance Medium481.41.2463
Triple Number Coastal/Long Distance High419.31.4309
Triple Number Windward/Leeward Low852.90.7035
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Performance Curve4 kt 6 kt 8 kt 10 kt 12 kt 14 kt 16 kt 20 kt 24 kt
Coastal/Long Distance1426.6944.4706.6573.9495.8455.3427.6387.4373.6
Custom scoring options for United States of America
Scoring OptionTODTOT
Triple Number AP Low653.40.9183
Triple Number AP Medium481.51.2461
Triple Number AP High419.31.4309
Triple Number Windward/Leeward Low891.10.6734
Triple Number Windward/Leeward Medium601.20.9980
Triple Number Windward/Leeward High506.11.1855
Single Number Predominant Upwind554.21.0826
Single Number Predominant Reaching483.41.2413
Single Number Predominant Downwind516.01.1629
Predominant Upwind - Low813.90.7371
Predominant Upwind - Low/Med598.71.0021
Predominant Upwind - Medium508.01.1811
Predominant Upwind - Med/High459.61.3053
Predominant Upwind - High440.11.3634
Predominant Downwind Low783.10.7662
Predominant Downwind Low/Med563.21.0653
Predominant Downwind Medium470.21.2760
Predominant Downwind Med/High418.41.4339
Predominant Downwind High390.61.5361
Predominant Reaching Low704.60.8516
Predominant Reaching Low/Med518.11.1581
Predominant Reaching Medium444.31.3504
Predominant Reaching Med/High405.51.4796
Predominant Reaching High384.71.5596
SA/DSPL Upwind18.11SA/DSPL Downwind43.10
Scoring OptionTODTOT
5-Band Windward/Leeward Low1001.20.5993
5-Band Windward/Leeward Low/Med716.90.8369
5-Band Windward/Leeward Medium587.91.0207
5-Band Windward/Leeward Med/High515.21.1645
5-Band Windward/Leeward High484.71.2380
Windward/Leeward 60-40 Low1014.20.5916
Windward/Leeward 60-40 Low/Med729.00.8230
Windward/Leeward 60-40 Medium600.40.9993
Windward/Leeward 60-40 Med/High528.41.1355
Windward/Leeward 60-40 High499.41.2014
5-Band AP Low721.30.8318
5-Band AP Low/Med559.01.0734
5-Band AP Medium472.91.2687
5-Band AP Med/High425.61.4097
5-Band AP High403.71.4862
5-Band SF Bay Tour - Low861.50.6964
5-Band SF Bay Tour - Low/Med684.60.8764
5-Band SF Bay Tour - Medium565.61.0607
5-Band SF Bay Tour - Med/High499.11.2022
5-Band SF Bay Tour - High470.81.2743
Chicago-Mac Upwind1.0400
Chicago-Mac All Purpose1.0818
Chicago-Mac Downwind1.1173
Bayview-Mac Cove Island0.7644
Bayview-Mac Shore0.7688
Harvest Moon Regatta417.01.4390
Club Certificate2025
SERENADEJPN 5960
ORC
Central Rating Office
Issuing certificates for
UNITED KINGDOM
Data in meters/kilograms (Metric)
HULL AND APPENDAGES (Lightship Trim)
ClassSWAN 54Measurement21/07/2021HIN54-006Plan reviewHull constructionCoredCarbon rudderNoLight stanchionsNoTrim tabNo
LOA16.443Max. Beam4.736Draft2.445Displacement22,001Wetted area57.56IMS L14.715LSM014.461Acc. length15.392Sink (kg/mm) 43.41
VCGD-0.300VCGM-0.278RM Rated (kg·m) 740.4Limit of positive stability(°) N/AStability IndexN/ADefault crew weight1,165Declared crew weightN/A
PROPELLER
Propeller TypeFolding 3 blades
InstallationShaft exposedTwin screwNoHydro generatorNo
PRD0.620PBW0.184PIPA0.0126
PSD0.038PHD0.116PHL0.150
PSA21.0°ESL1.150
ST10.031ST20.160ST30.232
ST40.072ST50.318
RIG
Forestay tensionFixedInner stayFixedMast materialAluminumSingle headsail furlerNoMainsail furlerNoArticulated bowspritNoNon-circular riggingNoFiber riggingNoAdjustable mast footNoRunning backstays1CheckstaysSpreaders2Rotating mastNo
P20.080IG21.082ISP22.637MDT10.179MDL10.329MDT2MDL2TLTaperMW0.297GO0.325
E6.710J5.930BAS2.100FSD0.048SFJ0.560SPLWPLTPS6.100BD0.420MWTMCG
Flying Headsail Foretriangles IdISPTPS
FLOTATION AND STABILITY
Calculation methodVCG entered directlyVCG entered-0.300Flotation Date21/07/2021
BALLAST
TANKS
INVENTORY
INVENTORY
Fixed Ballast Total0
Total deductible
Total deductible
Club Certificate2025
SERENADEJPN 5960
ORC
Central Rating Office
Issuing certificates for
UNITED KINGDOM
MAINSAIL
IdMHBMUWMTWMHWMQWAreaMeas.DateComment10.121.282.354.115.6578.05
HEADSAIL
IdHHBHUWHTWHHWHQWHLPHLUBtnFlyingFTAreaMeas.DateComment10.100.961.823.384.876.3819.80NoNo 65.61
ASYMMETRIC SPINNAKER
IdSLUSLESLSHWSFLRatioAreaMeas.DateComment124.7023.2023.9512.9014.5089%263.85
CRUISER/RACER REQUIREMENTS*
Accommodation length15.4 mTable area0.77 m²Headroom1.90 mMinimum number of berths7Personal gear stowage0.28 m³Fresh water capacity329 lMinimum number of seats in cockpit7Food stowage0.42 m³Fuel capacity158 lCabin soleStovesSinksGalley gear stowageToiletWash basinNavigation areaHanging locker
*This list is a summary of the requirements. See IMS Appendix 1 for details.