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.