export count data as genome tracks (e.g. for visualization in the browser)
# S4 method for DsATAC exportCountTracks( .object, type, outDir, formats = c("bed", "igv"), groupBy = NULL )
character string specifying the region type
output directory. Must be existing.
browser format. Currently only bed and "igv" are supported
a column in the sample annotation table to group by (the mean will be computed)
nothing of particular interest