X-ray analysis of RX J1720.1+2638. Upper left panel:Chandra 0.5–7.0 keV image, with represented a portion of the extraction regions. Black arcs indicate the position of cold fronts. Upper central panel: GGM filtered image. Upper right panel: Residual image after the subtraction of a double β-model. Middle left panel: SB profiles extracted along the directions depicted in the upper left panel. Middle central panel: best-fitting broken power-law model (blue line) with associated residuals on the SB discontinuity in the NW profile. Middle right panel: same as before for the SB discontinuity in the SE profile. Lower left panel: best-fitting double β-model (blue line) with associated residuals on NE profile. Lower right panel: same as before for the SW profile.