SYNOP1 single-slit observations on 2007-01-06 at 15:47 UT across an active region. From top to bottom: ratios of total counts in the 192 and 195 Å lines, as obtained by summing the pixel values and the Gaussian fit; ratio of the FWHM in the 195 versus the 192 Å lines; intensity ratio in the 195 Å line, between the 90 s and 30 s exposures; 192/195 Å and 192/193 Å line intensity ratios from the 90 s and 30 s exposures (in photons, dashed lines indicates expected values).