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Within the magnetar scenario, the ‘twisted magnetosphere’ model appears very promising in explaining the persistent X‐ray emission from soft gamma repeaters (SGRs) and anomalous X‐ray pulsars (AXPs). In the first two papers of the series, we have presented a 3D Monte Carlo code for solving radiation transport as soft, thermal photons emitted by the star surface are resonantly upscattered by the magnetospheric particles. A spectral model archive has been generated and implemented in  xspec . Here, we report on the systematic application of our spectral model to different  XMM–Newton  and  INTEGRAL  observations of SGRs and AXPs. We find that the synthetic spectra provide a very good fit to the data for the nearly all the source (and source states) we have analysed.

X‐ray spectra from magnetar candidates – III. Fitting SGR/AXP soft X‐ray emission with non‐relativistic Monte Carlo models