Spectral line profiles for the Fe IX 171 Å, Fe X 174 Å, and Fe X 174 Å lines without instrumental effects, taken from case G6b with z-axis as LOS, at selected positions along x-axis. For context, the top panels show maps of the line width against x and time, where the “x”’s mark the positions from where the corresponding line profiles with the same color (in the bottom panels) are taken. A movie of the time evolution for t ∈ [18, 23] min is available online.