'outside': beyond the data end (and its error bar); 'inside': inside against the data end;
'insideBase': inside against the baseline; 'center': centered in the bar. Stacked segments
always sit inside ('outside' = 'center') and only show when the text fits.
'outside': beyond the data end (and its error bar);'inside': inside against the data end;'insideBase': inside against the baseline;'center': centered in the bar. Stacked segments always sit inside ('outside'='center') and only show when the text fits.