Hi,
using set mxtics 10 with logscaled axis draws a superfluous minor grid line at the position of major tics. Using only set mxtics without an explicit frequency, works. Tested with CVS and 4.6.3:
reset
set terminal pngcairo size 1000,500
set output 'log-mtics.png'
set grid xtics ytics mxtics mytics lc rgb 'black' lw 3 lt 1, lc rgb 'gray70' lt 1 lw 1
set xrange [10:1000]
set logscale
set multiplot layout 1,2
set title 'default minor tics'
set mxtics
set mytics
plot x with lines
set title 'mxtics 10'
set mxtics 10
set mytics 10
plot x with lines
unset multiplot
See the attached image for the result: In the right plot, the major grid lines at 100 are overlayed with a minor grid line.
