Gnuplot 5.0p1 grid lines major and minor with different linetypes

[gnutron]

I'm having trouple with setting different linestyles for the major and minor grid lines...

Code:

reset
set terminal pdfcairo enhanced size 6,4
set output 'graph.pdf'

set style line 101 dt 1 lc "red"
set style line 102 dt 1 lc "gray"
set grid mxtics mytics ls 101, ls 102

set xrange [3:50]
set yrange [1:4]
set mxtics 5
set mytics 5

set xlabel 'x'
set ylabel 'y'

unset key

plot 0.1*x

reset
set term wxt
set out

This just gives the minor gray lines; the major lines don't even show up. Am I doing something wrong?

Thanks!

[gnutron]

Oops, I figured it out. Should have done:

set grid xtics ytics mxtics mytics linestyle 101, linestyle 102