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Fig. 7.

image

Comparison between standard reduction (position and frequency SM, black) with TP mode reduction (red) for NH3 observations with the old GBT spectrometer in two different sources. The spectrum shown at the top is identical to the one displayed in Fig. 6 but zoomed in on the lines. Noise improvement is close to . The difference between both reduction modes is displayed in blue and shifted by −0.5 K.

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