Histograms of the intensity in the two moss regions (marked as A and B in Figure 5) for Fe xii 195 Å observed with STEREO A (full line) and STEREO B (dashed line). Both regions are reduced in intensity by a factor of roughly 0.75 when viewed with STEREO B. This reduction in intensity is caused by Lyman continuum absorption of EUV emission by chromospheric plasma that occurs at similar heights as the EUV emission. Such absorption is increased when the region is viewed from the side, since the observable surface area of chromospheric plasma is increased.