Note that the B magnitude of the comparison star is very uncertain:
Green: with the V filter, Blue: with the B filter.
The upper 2 light curves are for VX Hya; the lower ones are for the check
star, shifted by -1.6mag in B, -1.2mag in V.
The error bars are +/- the 1-sigma statistical uncertainties.
No B measurement.
The peak in the check star V light curve is because of a satellite.