The pictures below are of Katherine Grainger and Cath Bishop, GB World Champions in the Women's Coxless Pair 2003.
The source is (with permission) from the FISA DVD of the Milan World Championships 2003.
There are 47 frames, each representing 0.033 seconds.
The stroke rate is 38.6
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Neil Wallace 11th August 2004.
With thanks to Doug Keen for the Javascript.