You must adjust both the alignment (maybe right , center or left ) and offset ( x,y coordinates relative to the default tics) xtics .
Here is an example that demonstrates three different possibilities. offset must be manually adjusted to get the correct value:
set xrange [0.5:3.5] set bmargin 5 set multiplot layout 1,3 set xtics ('first' 1, 'second' 2, 'third' 3) rotate by 45 right set title 'right aligned' plot x set xtics center offset 0,-1 set title 'centered' replot set xtics left offset 0,-2 set title 'left aligned' replot unset multiplot
This gives (from 4.6.4):

Christoph
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