Top: logarithmically-scaled intensity of the Fe XII 195 Å line along 304″ of the 1″ slit, across AR loops observed on 2007 May 6, as in Fig. 12 of Young et al. (2009). Middle: intensity ratios of the Fe XII lines, using the ground calibration. Bottom: intensity ratio of the Fe XII 192 versus 195 Å lines as a function of the peak intensity in the stronger line, and for two different radiometric calibrations.
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