set terminal png         # gnuplot recommends setting terminal before outputset output "graph1.png"  # The output filename; to be set after settingset xrange [-pi:pi]                       # we want only one cycleset xtics ("0" 0, \	        "90" pi/2, "-90" -pi/2, \			"" pi/4 1, "" -pi/4 1,  \			"" 3*pi/4 1, "" -3*pi/4 1)set gridset xlabel "Angle,\n in degrees"set ylabel "sin(angle)"plot sin(x)