Data missing from center of footprint plot

[michanthchristopher]

When I run Footprint() and set an argument for a specific motif, I get a plot that I would expect from the vignette.

flare_foot <- Footprint(
object = hrff,
motif = 'SP1',
in.peaks = TRUE,
genome = BSgenome.Hsapiens.UCSC.hg38,
key = 'SP1_in_peaks'
)

However, when I specify regions of interest like DAR, my plot appears to have missing data.

flare_foot <- Footprint(
object = hrff,
in.peaks = TRUE,
region = dar_resized,
genome = BSgenome.Hsapiens.UCSC.hg38,
key = 'SP1_in_peaks'
)

Is this a known phenomenon or a mathematical artifact of only testing a set of regions? I tried to reproduce with atac_small, but cannot get footprint() to work on that object

[timoast]

How many DAR do you have? This might be an artefact of having a small number of regions