If I do not plot empty cells, how do I change the category axis?
 

Hello,

I have four columns of data, the first two of which belong to one condition,
the second two belonging to condition two. I want to compare performance
between the two conditions on the same graph by separating the two. I have
added a column between the two conditions to create a gap, and selected the
'plot empty cells as: not plotted' option. I am now wondering if I can change
the category (X) axis to accommodate this? At the moment I cannot get rid of
the 'spare' value on the category axis. Does anyone know of a way around this?