Average NIR veiling (left) and the veiling variability diagnostic (right) measured in different wavelength regions. The top and bottom panels show the targets with r_K higher and lower than 1, respectively. The veiling increases from the Y to the K band for most of the targets. The error bars in the left panel represent the standard deviation of the average veiling over all the observation nights. In this figure and the following figures, the color and symbol codes in the panels identify each target.