σe 353 (upper) and LH (lower) vs. NH computed at 30′ resolution from Eq. (13) with three values of XCO: [ 1,2,3 ] × 1020 H2 cm-2 K-1 km-1 s. The mean values of σe 353 and LH were computed in bins of NH equally spaced in log; the error bar is the standard deviation, shown only for XCO = 2 × 1020 H2 cm-2 K-1 km-1 s. The horizontal dotted line indicates the average values found in the low NH i mask.
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