set terminal postscript eps color enhanced font "Helvetica,16pt" size 8cm,6cm dashlength 2.0
set output "trendsun.eps"

# common settings
set format y "%2.1f"
set tics scale 2
set tics nomirror
set ytics 0.1
set yr [1.525:1.875]

set format x2 "%2g"

S(x)=s
s=1.7
set fit errorvariables
set xrange [20:70]
	FIT_LIMIT=1.e-15
	FIT_MAXITER=1000
	fit S(x) 'g2trend.txt' using 4:5:6 via s

set ylabel "g^{(2)}({/Symbol t}=0)" rotate by 90

set x2tics 10 nomirror
set x2r [20:70]
set x2label "Elevation {/Symbol a} [Degrees]"

set xtics ("5pm" 28.68, "4pm" 42.18, "3pm" 54.88, "2pm" 65.39) nomirror
set xl "Time on 28th May 2015"

set samples 1000
plot 'g2trend.txt' using 4:5:6 w yerrorbars lc 1 ps 0.8 pt 7 notitle,\
S(x) w l lw 3 lt 2 lc -1 notitle