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Table 1

Distance bins defined for the stacking of ISM spectra.

Distance bin (pc) Pixel number(a) S/N ⩾ 200 (%)
0–130 11 179 48.7%
130–200 11 202 67.3%
200–270 11 204 68.0%
270–350 11 207 66.6%
350–430 11 203 52.9%
430–530 11 204 50.2%
530–650 11 200 48.4%
650–780 11 189 51.3%
780–950 11 167 64.8%
950–1150 11 146 66.1%
1150–1400 11 135 63.4%
1400–1670 11 093 53.0%
1670–2000 11 008 46.3%
2000–2250 10 656 30.9%
2250–2550 10 416 27.3%
2550–2950 10 050 27.3%
2950–3500 9464 26.1%
3500–4500 9060 25.0%
4500–5000 6659 7.9%
5000–5500 5943 5.2%
5500–6000 5164 3.0%
6000–6500 4528 1.2%
6500–7000 3876 0.5%
7000–7500 3392 0.3%
7500–8000 2959 0.1%
8000–8500 2541 0.0%
8500–9000 2147 0.1%
9000–9500 1838 0.0%
9500–10000 1598 0.1%

Notes. (a)Number of HEALPixels with Ntar ⩾ 1 in each distance bin.

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