Figure 1. The time required for coronal 3σ measurements of two different line-of-sight magnetic field strengths as a function of target brightness. Values are shown for two different field strengths and two aperture sizes. The spectrum line is Fe XIII 1074.8 nm and the sampling aperture is one arc sec square. A sky background of 10 × 10-6 and an overall efficiency of 0.1 are assumed. A loop lifetime of 1000 seconds enforces a need to use large apertures to reach expected magnetic field strengths. [NOTE: Figure not included with this reprint.]

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