Unfolded NuSTAR spectra of GK Per. The model spectrum was computed for fixed M/M⊙ = 0.86. Other parameters found are Rm/R ≈ 2.3 and NH,1 ≈ 1.7 × 1023 cm-2 . The obtained partial covering parameters are NH,2 ≈ 1.24 × 1024 cm-2 and covering fraction CF ≈ 0.82 and .
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