#plot sin(x)
#plot [0:2*pi] sin(x)
#replot
#! ls


set xlabel " x (mm) "
set ylabel " Visc (Poise)" 
set xtics 10
set mxtics 4
set ytics 50
set mytics 5
set title "primo grafico"
pl [0:30][0:300]  "dati.txt" index 0 u 1:2:3  w yerr title "x_2^2", "dati.txt" index 1  u 1:2:3 w yerro title "x_2^1"
#pl [0:30]  "dati.txt" index 0 u 1:2:($3*10)
#set logscale y
#fit 
f(x)=a +b*x
fit [0:10] f(x) "dati.txt" index 0 using 1:2:3 via a,b
g (x)= c+d*x+e*x*x
fit [10:100] g(x) "dati.txt" index 1 using 1:2:3 via  c,d,e
pl [0:30][0:300]  "dati.txt" index 0 u 1:2:3  w yerr title "x_2^2", "dati.txt" index 1  u 1:2:3 w yerro title "x_2^1", f(x),g(x)
#pause mouse
#print output
set terminal pdfcairo color enhanced
set output "myFirstGraph.pdf" 
pl [0:30][0:300]  "dati.txt" index 0 u 1:2:3  w yerr title "x_2^2", "dati.txt" index 1  u 1:2:3 w yerro title "x_2^1", f(x),g(x)
set terminal x11