J-band light curve of S106IR. The solid line is the fit to the J light curve obtained with the Wilson–Devinney program as described in Sect. 3.2. The measurements for two comparison stars in the field are shown for reference. The middle panel shows the light curve of 2MASS J20272671+3721149, a star of magnitude similar to S106IR. The smaller scatter is due to its position projected on an area devoid of nebulosity. The bottom panel shows the light curve of 2MASS J20273393+3722349, a fainter star whose measurements are also unaffected by nebulosity.