Introduction Recent analysis performed on ASDEX Upgrade, NSTX and DIII-D suggest that the density profile position plays an important role in pedestal stability [1,2,3]. On JET and ASDEX Upgrade, it has been observed that the electron temperature and electron density profiles can have different relative pedestal positions (so-called relative shift). As shown in [4,5], the increase of the relative shift is correlated with the reduction in the normalized pressure gradient, leading to a weakening of the pedestal stability. Therefore, in this work, analysis of the effect of the relative shift has been carried on the COMPASS tokamak discharges.
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