Comparison of the four Gemini NIRI K_s-band observing runs of LkCa 15. All datasets were reduced with classical ADI. As in Fig. 2, the upper row shows the resulting images at a linear stretch of ± 1.6 × 10^-3 times the stellar peak flux, whereas the bottom row shows radially renormalized versions of the same images at a stretch of ± 4σ. a) K1, b) K2, c) K3, d) K4. Since the target star is saturated in runs K1 and K2, their flux normalization is approximate.