I have the following gnuplot script:
#!/bin/bash
gnuplot << EOF
set term postscript portrait color enhanced
set output 'temp.ps'
set border lw 0.2
unset key
set size 1,1
set origin 0,0
set size ratio 1
set size 0.47,0.47
set mxtics 2; set mytics 4
f(x,z)=z+5-5*log10(x)
set style fill transparent solid 0.1
set yrange [12:-2]; set xrange[0:10000]
plot f(x,17.55) w filledcurve lc rgb "black", \
f(x,17.5) w lines lt 2 lc rgb "green"
EOF
Which gives me an output like this:

I need two fix two things in this image:
1- the filled zone has a black line which delimitates it and this should go away
2- the filling is covering the x and y tics and this should not happen
Thanks!
To address 1):
To address 2):
As a side note,
transparentin yourset style fillcommand does nothing in the postscript terminal as it doesn’t support solid transparency.