  <!ENTITY FIG.plot2-layer-mark 'plot2-layer-mark.png'>
  <!ENTITY FIG.plot2-layer-size 'plot2-layer-size.png'>
  <!ENTITY FIG.plot2-layer-sizexy 'plot2-layer-sizexy.png'>
  <!ENTITY FIG.plot2-layer-xyvector 'plot2-layer-xyvector.png'>
  <!ENTITY FIG.plot2-layer-xyerror 'plot2-layer-xyerror.png'>
  <!ENTITY FIG.plot2-layer-xyellipse 'plot2-layer-xyellipse.png'>
  <!ENTITY FIG.plot2-layer-skyellipse 'plot2-layer-skyellipse.png'>
  <!ENTITY FIG.plot2-layer-xycorr 'plot2-layer-xycorr.png'>
  <!ENTITY FIG.plot2-layer-skycorr 'plot2-layer-skycorr.png'>
  <!ENTITY FIG.plot2-layer-line 'plot2-layer-line.png'>
  <!ENTITY FIG.plot2-layer-line3d 'plot2-layer-line3d.png'>
  <!ENTITY FIG.plot2-layer-linearfit 'plot2-layer-linearfit.png'>
  <!ENTITY FIG.plot2-layer-label 'plot2-layer-label.png'>
  <!ENTITY FIG.plot2-layer-contour 'plot2-layer-contour.png'>
  <!ENTITY FIG.plot2-layer-grid 'plot2-layer-grid.png'>
  <!ENTITY FIG.plot2-layer-fill 'plot2-layer-fill.png'>
  <!ENTITY FIG.plot2-layer-quantile 'plot2-layer-quantile.png'>
  <!ENTITY FIG.plot2-layer-skyvector 'plot2-layer-skyvector.png'>
  <!ENTITY FIG.plot2-layer-histogram 'plot2-layer-histogram.png'>
  <!ENTITY FIG.plot2-layer-kde 'plot2-layer-kde.png'>
  <!ENTITY FIG.plot2-layer-knn 'plot2-layer-knn.png'>
  <!ENTITY FIG.plot2-layer-densogram 'plot2-layer-densogram.png'>
  <!ENTITY FIG.plot2-layer-gaussian 'plot2-layer-gaussian.png'>
  <!ENTITY FIG.plot2-layer-skydensity 'plot2-layer-skydensity.png'>
  <!ENTITY FIG.plot2-layer-healpix 'plot2-layer-healpix.png'>
  <!ENTITY FIG.plot2-layer-xyzvector 'plot2-layer-xyzvector.png'>
  <!ENTITY FIG.plot2-layer-xyzerror 'plot2-layer-xyzerror.png'>
  <!ENTITY FIG.plot2-layer-spectrogram 'plot2-layer-spectrogram.png'>
  <!ENTITY FIG.plot2-layer-yerror 'plot2-layer-yerror.png'>
  <!ENTITY FIG.plot2-layer-mark2 'plot2-layer-mark2.png'>
  <!ENTITY FIG.plot2-layer-link2 'plot2-layer-link2.png'>
  <!ENTITY FIG.plot2-layer-poly4 'plot2-layer-poly4.png'>
  <!ENTITY FIG.plot2-layer-mark4 'plot2-layer-mark4.png'>
  <!ENTITY FIG.plot2-layer-polygon 'plot2-layer-polygon.png'>
  <!ENTITY FIG.plot2-layer-area 'plot2-layer-area.png'>
  <!ENTITY FIG.plot2-layer-central 'plot2-layer-central.png'>
  <!ENTITY FIG.plot2-layer-arealabel 'plot2-layer-arealabel.png'>
  <!ENTITY FIG.plot2-layer-function 'plot2-layer-function.png'>
  <!ENTITY FIG.plot2-layer-skygrid 'plot2-layer-skygrid.png'>
  <!ENTITY FIG.plot2-layer-spheregrid 'plot2-layer-spheregrid.png'>
  <!ENTITY FIG.plot2-shading-flat 'plot2-shading-flat.png'>
  <!ENTITY FIG.plot2-shading-auto 'plot2-shading-auto.png'>
  <!ENTITY FIG.plot2-shading-transparent 'plot2-shading-transparent.png'>
  <!ENTITY FIG.plot2-shading-translucent 'plot2-shading-translucent.png'>
  <!ENTITY FIG.plot2-shading-density 'plot2-shading-density.png'>
  <!ENTITY FIG.plot2-shading-aux 'plot2-shading-aux.png'>
  <!ENTITY FIG.plot2-shading-weighted 'plot2-shading-weighted.png'>
