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Thanks to Jeremy for his interesting plot of altitude around noon. And how
refreshing it is to see it reproduced, warts and all, with no attempt to
disguise what must have been a single "duff shot", for which any mariner
should be forgiven.

I've tried to go through the routine of folding at the point of symmetry,
but have hit a minor snag when trying to get things just-so.

It's quite clear what's plotted along the y axis, but what, exactly, is
plotted along the x axis? There's no time axis shown. Is it actually time,
or is it, as I suspect, observation number, 1 to 31, corresponding to the 31
ticks along the bottom? If the observations were taken at exactly equal time
intervals, it would make no difference, the shape of the curve would be the
same either way. But they aren't, so it matters (a bit), especially when we
are trying hard to maximise the precise information we can squeeze from that
curve.

George.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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