docs: def plot_campaign(self, campaign=0, annotate_channels=True, **kwargs):
          """Plot all the active channels of a campaign."""
          fov = getKeplerFov(campaign)
          corners = fov.getCoordsOfChannelCorners()
  
          for ch in np.arange(1, 85, dtype=int):
              if ch in fov.brokenChannels:
                  continue  # certain channel are no longer used
              idx = np.where(corners[::, 2] == ch)
              mdl = int(corners[idx, 0][0][0])
              out = int(corners[idx, 1][0][0])
              ra = corners[idx, 3][0]
              if campaign == 1002:  # Concept Engineering Test overlapped the meridian
                  ra[ra < 180] += 360
              dec = corners[idx, 4][0]
              self.ax.fill(np.concatenate((ra, ra[:1])),
                           np.concatenate((dec, dec[:1])), **kwargs)
              if annotate_channels:
                  txt = "K2C{0}\n{1}.{2}\n#{3}".format(campaign, mdl, out, ch)
                  txt = "{1}.{2}\n#{3}".format(campaign, mdl, out, ch)
                  self.ax.text(np.mean(ra), np.mean(dec), txt,
                               ha="center", va="center",
                               zorder=91, fontsize=10,
                               color="#000000", clip_on=True)