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Table 2

Parameters of absorption lines shown in Fig. 1.

Hii region RA Dec Continuuma Line widthb Velocity Line/continuum τ HCN column densityc
(J2000) (J2000) (K) (km s-1) (km s-1) (cm-2)

G10.47+0.03 B1 18 08 38.243  −19 51 50.22 2600 18.9 65.8 0.72 0.33 5.5(19)
G10.47+0.03 B2 18 08 38.22  −19 51 50.62 1800 18.5 66.4 0.776 0.25 4.1(19)
G10.47+0.03 A 18 08 38.188  −19 51 49.74 750 10.3 68 0.67 0.4 3.6(19)

SgrB2-N K2 17 47 19.882  −28 22 18.45 1150 10.0 63.6 0.16 1.83 1.6(20)
SgrB2-N K3 17 47 19.902  −28 22 17.18 1200 7.3 64.3 0.652 0.43 2.8(19)

SgrB2-M F1c 17 47 20.126  −28 23 03.9 2650 11.5 60.4 0.664 0.41 4.1(19)
SgrB2-M F1e 17 47 20.131  −28 23 04.02 2300 9.2 60.9 0.474 0.75 6.1(19)
SgrB2-M F1f 17 47 20.147  −28 23 03.88 3500 15.3 55.2 0.714 0.34 4.4(19)
SgrB2-M F3 17 47 20.172  −28 23 04.58 5350 6.7 71.2 0.696 0.36 2.1(19)

Notes. The beam size is 0.14′′ × 0.1′′ for G10.47+0.03 and 0.15′′ × 0.11′′ for SgrB2. The rms on 1 km s-1 channels is 120 − 150 K. Results of Gaussian fits and lower limits on the optical depth τ and on the column density of hot HCN are given.

(a)

The continuum flux density is the brightness temperature at the given locations in the line maps (which have a larger beam than the pure continuum maps). To convert from K to mJy/Beam, one has to divide by 53 for G10.47+0.03 and by 45 for SgrB2.

(b)

Full Width at Half Maximum (FWHM) of the Gaussian.

(c)

The numbers in parentheses are powers of 10.

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