Variation in spectral parameters with pulse phases at three luminosity epochs of the pulsar using an absorbed cutoff power law (i.e. cutoffpl) model along with blackbody components. The absorption feature in hard X-rays was fit with a cyclotron line absorption component (cyclabs). The error bars represent 1σ uncertainties. The observation IDs are shown on the top of each panel. Corresponding epochs of the Insight-HXMT observations can be seen from Table A.1 in the appendix.