Correlation between τ250 and with β = 1.8 for the main filament area shown in Fig. 2. τ250 map is convolved to the same 60 resolution as map. The data are fitted with a straight line, using data in the ranges τJ = 0–2 (black line) and τJ = 2–4 (red line). The values of the slopes, k, are indicated in the frame with corresponding colours.
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