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Thanks for the plots. I guess to actually measure the scatter from
the lightcurves, you'd have to "take out" the lightcurve with some
high-order trigonometric function, then look at the rms scatter.
>> I suspected they were Geneva V magnitudes not
>> transformed to Johnson's V.
>> It turns out that this 0.015 mag. difference is explained by the difference
>> of the two photometric systems, where Geneva's V can be even 0.02 mag.
>> brighter for the bluest stars.
I didn't know there was a (small) color term in the Geneva V. I _do_
know there is a cyclic error as a function of _RA_ due to a closing error
in the standard system. This was found by Cousins & Menzies when they
compared the SAAO observations of Landolt standards against Geneva,
Walraven, and E-region standards. No RA-error problem in the E-region,
Landolt, or Walraven, but there was in the Geneva and SAAO data.
\Brian
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