2- Multiple graphs

Lets take the same example. But this time, we will compare the daily temperature for week1 and week2. So our file would look like this:

Data2:

1 29 34
2 31 32
3 30 33
4 28 30
(...)

Only one line is going to be modified in our script file:

Script2:

set key reverse Left outside 

set term png 

set output "Graph2.png"

set title "Daily temperature comparaison"    
set xlabel "Days ->"                     
set ylabel "Temperature ->"                 

set offset 1,1,10,10 

plot 'Data2' using 1:2 title 'Week 1' with lines, 'Data2' using 1:3 title 'Week 2' with lines

#Adding to the plot function another set of arguments. The two sets are structured the same, and separated by a coma.

The result will be as follows: