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Ground-based photometric observations from WASP have been calibrated, scaledand combined with Kepler observations of the $\delta$ Sct star KIC 7106205,allowing us to extend the time base of the study of the unexplained amplitudeand frequency variation of a single pressure mode at $\nu=13.3942$ d$^{-1}$ by2 yr. Analysis of the combined data sets, spanning 6 yr, show that theamplitude modulation in KIC 7106205 has a much larger range than a previousstudy of the Kepler data alone indicated. The single pressure mode decreasedfrom $11.70 \pm 0.05$ mmag in 2007, to $5.87 \pm 0.03$ mmag in 2009, and to$0.58 \pm 0.06$ mmag in 2013. Observations of the decrease in mode amplitudehave now been extended back 2 yr before the launch of Kepler. With observationsover a longer time span, we have been able to further investigate the decreasein mode amplitude in KIC 7106205 to address the question of mode amplitudestability in $\delta$ Sct stars. This study highlights the usefulness of theWASP data set for extending studies of some Kepler variable stars.

Combining WASP and Kepler data: the case of the $\delta$ Sct star KIC 7106205