Nitrogen isotopic ratios in N2H+ obtained in this work (red stars) compared with the values obtained towards prestellar cores (blue dots, Redaelli et al. 2018). L1544 and L694-2 present two values because in those sources both N15NH+ and 15NNH+ were detected. The blue dashed curve shows the weighted average of the prestellar sample, and the shaded area the associated uncertainty. The red dot-dashed curve is the average for the protostellar objects. The black solid line shows the elemental value of 14N/15N = 440.
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