Intensities of loops 1 and 2 (when rendered separately) in different projections along their axes; we took advantage of the fact that the flux tubes have similar lengths and plotted intensity vs. normalized length units. Note that loop 1 is brighter in the x −  y projection at the apex while loop 2 is brighter at the apex in the x −  z projection. Note also the intensity peak at the loop top of loop 2 in the y −  z projection. It is a real loop top feature, and we will return to it further in the text.