The usual `height` and `width` options in
`chartOpts` are ignored in this plot. Instead, you may provide
`pixelPerCell` (number of pixels per cell in the heat map),
`chrGap` (gap in pixels between chromosomes in the heat map),
`cellHeight` (height in pixels of each cell in the
cross-tabulation), `cellWidth` (width in pixels of each cell
in the cross-tabulation), and `hbot` (height in pixels of the
lower panels showing cross-sections of the heat map)