PDF for pixel (70 189) where a double peak in the BG PDF has been detected. Our programme looks for secondary peaks with 0.5 times the intensity of the maximum of the PDF and located at a distance higher than 0.5 times the mean FWHM, where the mean has been taken over all the pixels in each parameter. The adopted uncertainty of Y BG for this pixel – the 16th to 84th percentile range – accounts for the double peak of the PDF for this particular pixel.
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