Fig. 15
Value of σS obtained from the standard deviation σR of the residual maps Rν(x,y) from which contributions from the IRAS or Planck and the GBT noise were removed quadratically (see Eq. (7)), plotted as a function of the average HI column density of each field (sum of LVC, IVC and HVC). The dashed line is the average of σS for fields with NHI < 2 × 1020cm-2 (see Table 3).
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