Fig. 1
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327 MHz radio continuum image (Frail et al. 1993) of the W28 SNR borrowed from Fig. 1 of Claussen et al. (1997). The gray scale at the top is in units of mJy beam−1. The location of the OH (1720 MHz) emission concentrations have been marked with black circles. The sub-mm wavelength observations reported here were carried out towards the F group of OH masers shown in Fig. 2.
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