Variation of σe 353 (upper) and LH (lower) as a function of Tobs in the diffuse ISM. Data used were smoothed to 30′, the angular resolution of the H i data. Only pixels where 1 × 1020<NH i< 2.5 × 1020 cm-2 were selected. The greyscale shows the point density in the two-dimensional histogram while the blue points indicate the average and standard deviation of LH and σe 353 in bins of Tobs.
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