Frequency spectra of the goodness-of-fit parameter χ²/ν of least squares sine wave fit to 1987 (top) and 1990 (bottom) MB91 V magnitude data. The upper fit spectrum of each panel shows the fit spectrum to the original data. The lower spectrum of the top and bottom panels is the fit spectrum after a sine wave with frequency 1.155 c d^-1 (period 0.866 d), amplitude 11.7 mmag, and with frequency 10.80 c d^-1 (period 0.0926 d), amplitude 9.2 mmag respectively, and appropriate phase, has been subtracted from the measured V magnitudes.