All Figures

Figure 2: IRAS color-color diagram a) and 2MASS color-color diagram b). The solid triangles indicate sources detected in NH3emission while the open squares denote sources without NH3emission. The dotted lines in the left panel indicate the color box of UCHII regions (Wood & Churchwell 1989b). In the right panel, the solid curve shows the infrared color of the main sequence and giant branch (Bessell & Brett 1988); the dotted line separates the sources with infrared excesses from the reddened main-sequence stars allowing for errors in the colors.

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In the text

	Figure 3: a) Number of sources detected (solid triangle) and non-detected (open square) in as a function of source distance. b) The detection rate of vs. source distance.
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In the text

	Figure 4: Maps of MSX and NH3 for cores offset from the IRAS position. The triangle marks the position of the IRAS source. Left: the overlay of NH3 contours on the MSX image in the band A (grey scales); Right: same as the left panel but for the MSX band E in grey scale. The MSX flux is in W m-2 sr-1. The source name is indicated at the lower-left corner of each panel.
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In the text

	Figure 5: a). The relation between the kinetic temperature and bolometric luminosity. The filled circle represent sources with NH3 cores peak at the IRAS sources, the open circles indicate sources with the core peaks offset from the IRAS sources. b). Same as a) but for the relation between the kinetic temperature and the (1, 1) line width. The line is a least squares fit to the filled circles.
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In the text

	Figure 6: The line width vs. bolometric luminosity. a) is for the (1, 1) line and b) is for (2, 2) line. The symbols are the same as in Fig. 5. The line in a) is a least squares fit for the filled circles.
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In the text

	Figure 7: Line width vs. the source size. The filled and the open circles are the same as in Fig. 5. The open triangle denotes the IRAS 02485+6902 which was not classified. The solid line is a least squares fit for the filled circles and the dashed line for the whole sample.
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In the text

	Figure 8: H2 density calculated from the statistical equilibrium, , vs. that from the ammonia column density, . The symbols are the same as in Fig. 5. The line indicates where the two densities are the same.
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In the text

Figure 1: spectra and velocity integrated intensity. For each source the left panel is the spectra and the right panel is the integrated emission. The solid and dashed contours show the (1, 1) and (2, 2) integrated intensity and the grey scales show the integrated intensity of the (3, 3) emission. The contours of the (1, 1) and (2, 2) intensity begin from 30 to 90 of the map peak intensity; those of (3, 3) begin from 65 with a step of 20. All the intensity peak values are listed in Table 2 as P(1, 1), P(2, 2) and P(3, 3). The ellipse denotes the position and the uncertainty of the IRAS source. The source name and the position where the spectra were taken from are indicated at the upper-right corner of the spectral panel.

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In the text

	Figure 1: continued.
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In the text