  Since the GALLEX and GNO datasets were derived from closely related
experiments, there is a natural tendency to merge them. This is perhaps
appropriate for any analysis based on the hypothesis that the solar neutrino
flux is constant, but it is not necessarily appropriate for an analysis that
allows for possible variability, since the GALLEX and GNO experiments belong to
different solar cycles. Moreover, we find significant differences between the
GALLEX and GNO datasets. It appears, from inspection of the time series and
histograms, that GNO measurements are compatible with the assumption that the
solar neutrino flux is constant, but GALLEX measurements are not. Furthermore,
power-spectrum analysis yields evidence of rotational modulation in GALLEX data
but not in GNO data. We compare our results with those of Pandola, who claims
that GALLEX-GNO data show no evidence for variability.
