Typical spectra of Cygnus X-1 with HXMT observations. Upper panel: a spectrum in the hard state (obs ID: P0201012171). The spectrum in the lower panel: is in the soft state (obs ID: P0101315057). Data from the LE, ME, and HE telescopes are denoted with black, red, and blue crosses, respectively. The power-law continuum, the thermal component, and the iron line emission are indicated with dashed lines.