Calculated abundance ratios of gas phase species C32S/C34S as a functionof cloud age for conditions in (a) the +50 km s−1 Cloud, (b) the envelope of Sgr B2(N), and (c) l.o.s. cloudstowards Sgr B2(N) (see Sect. 4.2 for details). Low values for the gas temperatures were chosen to illustrate an upper limit for fractionation. The vertical grey loci represent values given by the most probable chemical age. The observational results from this study are illustrated as horizontal light grey rectangles (including the uncertainties).
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