docs: def ximshow_unrectified(self, slitlet2d):
          """Display unrectified image with spectrails and frontiers.
  
          Parameters
          ----------
          slitlet2d : numpy array
              Array containing the unrectified slitlet image.
  
          """
  
          title = "Slitlet#" + str(self.islitlet)
          ax = ximshow(slitlet2d, title=title,
                       first_pixel=(self.bb_nc1_orig, self.bb_ns1_orig),
                       show=False)
          xdum = np.linspace(1, EMIR_NAXIS1, num=EMIR_NAXIS1)
          ylower = self.list_spectrails[0](xdum)
          ax.plot(xdum, ylower, 'b-')
          ymiddle = self.list_spectrails[1](xdum)
          ax.plot(xdum, ymiddle, 'b--')
          yupper = self.list_spectrails[2](xdum)
          ax.plot(xdum, yupper, 'b-')
          ylower_frontier = self.list_frontiers[0](xdum)
          ax.plot(xdum, ylower_frontier, 'b:')
          yupper_frontier = self.list_frontiers[1](xdum)
          ax.plot(xdum, yupper_frontier, 'b:')
          pause_debugplot(debugplot=self.debugplot, pltshow=True)