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The O IV intercombination lines observed by the Interface Region ImagingSpectrograph (IRIS) between 1397 and 1407 A provide useful density diagnostics.This document presents data that address two issues related to these lines: (1)the contribution of S IV to the O IV 1404.8 line; and (2) the range ofsensitivity of the O IV 1399.8/1401.2 ratio.

Report on the O IV and S IV lines observed by IRIS