def _plot(self, region=None, cax=None):
        self._new_region(region)
        bin_coords = [(x.start - 1) for x in self.sr]
        ds = self.da_sub[self.init_row]
        self.line, = self.ax.plot(bin_coords, ds)
        if not self.is_symmetric:
            self.current_cutoff = (self.ax.get_ylim()[1] - self.ax.get_ylim()[0]) / 2 + self.ax.get_ylim()[0]
        else:
            self.current_cutoff = self.ax.get_ylim()[1]/ 2
        self.ax.axhline(0.0, linestyle='dashed', color='grey')
        self.cutoff_line = self.ax.axhline(self.current_cutoff, color='r')
        if self.is_symmetric:
            self.cutoff_line_mirror = self.ax.axhline(-1*self.current_cutoff, color='r')
        self.ax.set_ylim((np.nanmin(ds), np.nanmax(ds)))