问如何修复gnuplot中的xtics标签重叠

EN

reset
set terminal windows

set style line 1 lt 1 linewidth   3
set style line 2 lt 2 linewidth   3 
set style line 3 lt 3 linewidth   3 
set style line 4 lt 4 linewidth   3 
set style line 5 lt 5 linewidth   3
set style line 6 lt 6 linewidth   3


set border linewidth 3

set xzeroaxis
set yzeroaxis

set xlabel '{/Helvetica-Oblique t (dias)}' enhanced font ',28'

set key center top
set key center right
set key top right
set key box

set tics scale 1.5

set grid ytics
set grid xtics

set xtics 0,250,3500

set ytics 0,0.1,1


set title 'Simulacao' font ',26'

set samples 100

plot "./fort.100"  using 1:2 with lines title 'Ms' linestyle 1, \
     "./fort.100"  using 1:3 with lines title 'Mi' linestyle 2, \
     "./fort.100"  using 1:4 with lines title 'A ' linestyle 3, \
     "./fort.100"  using 1:5 with lines title 'H ' linestyle 4, \
     "./fort.100"  using 1:6 with lines title 'I ' linestyle 5

pause -1

set terminal postscript eps enhanced
set termoption enhanced
set output "xsol-pb.eps"

replot

set terminal postscript eps enhanced color font ',22'
set termoption enhanced
set output "xsol.eps"

replot

set terminal png giant size 900,600 enhanced 
set termoption enhanced
set output "xsol.png"

replot