Light curves of S5 0716+714 (top and middle panels) and of the secondary calibrator, 0836+710, (bottom panel) obtained from multi-epoch observations at the K-band and the Q-band simultaneously. In the middle panel of each epoch, the flux densities of S5 0716+714 correspond to the flux densities without the calibration, with relative gain of 0836+710. The top panel represents the finally-calibrated flux densities of S5 0716+714. Red and black symbols indicate the K-band and the Q-band, respectively. Here, the error bars indicate 1σ measurement error.