gnuplot - place label aligned to right, at certain y coordinate? -

i need place label @ right, above of fitted average horizontal rule. have y-coordinate of rule, don't know coordinate of right border of graph.

i saw, use at graph 0.5,0.8 syntax, if horizontal rule fixed, isn't.

you can use different coordinate systems x , y values. available coordinate systems are:

• first: value on left , bottom axes.
• second: value on right , top axes.
• graph: relative area within axes, 0,0 bottom left , 1,1 top right.
• screen: relative entire canvas.
• character: depends on chosen font size.

so, if x-value should relative graph, use graph 0.5, y-value can use first yval:

set label @ graph 0.5, first yval+ofs 

here, yval y-value of horizontal line, , ofs offset in order displace label bit.