Illustration of the criterion used to create the mask. The grid represents part of an RMS map. To determine whether the central pixel [x,y] is masked or not, the bright pixels values shown on the bottom left are used; in this example, only the MIN_AREA-th pixel value =6 is used to compare with the local noise. Considering the central pixel [x, y], the comparison to the local noise is only done for the 9 pixels adjacent pixels (i.e. red square). The values used for the detection threshold and the minimal area in this example are 2 and 4, respectively. On the left, none of the pixels in the red area have values that are strictly less than min(Bp)/DETECT_THRESH = 3, which results in the central pixel being masked. On the right panel, three pixels fulfil the condition and the central pixel is not masked.