Upper panel: line positions, in wavelength units, of the Fe xii λ193, Fe x λ257, and Fe x λ184 lines versus time (and solar X) at disk centre. The wavelength values indicated in the panel have been subtracted to ease comparison. Lower panel: wavelength difference between spectral lines for the data in the upper panel versus time (and solar X). It can be seen that changes in line distances (wavelength differences) are very small ( ≈ 1 mÅ, ≈ 1.5 km s-1) and show no dependence on time.
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