IL Hya light, color, and temperature curves. a) V data (dots) and their fits with a trend (dashed line; an artificial very long period fit), and with co-added modulations of timescales of 9 yr and 14 yr (line).The dates of the two Doppler images are indicated. b) B − V (upper dots) and U − B (lower dots). The U − B data were artificially shifted by +045 for easier presentation. c) V − I_C data (dots) and their fits with a trend (dashed line), and with co-added modulation of a marginally significant variability on a timescale of ≈7 yr (line). Seasonal average comp-check values are also plotted shifted by +120 for easier presentation. d) Effective temperatures from V − I_C at maxima (triangles) and minima (squares) of the light curves.