How can I define one format for the main grid (xtics, ytics) and another one for the minor tics (mxtics and mytics)?
I tried:
set style line 100 lt 1 lc rgb "gray" lw 2
set style line 101 lt 1 lc rgb "gray" lw 1
set grid xtics ytics ls 100
set grid mxtics mytics ls 101
But this take the last defined lw (1) for all grids.