Preserve epoch in add_segments_bar
This PR fixes an issue with gwpy.plot.Plot.add_segments_bar
where the epoch
of the parent axes would be unset when creating the segments bar axes.
cc: @alurban
This PR fixes an issue with gwpy.plot.Plot.add_segments_bar
where the epoch
of the parent axes would be unset when creating the segments bar axes.
cc: @alurban