set output './ring_per_diam_f.ps' 
set term postscript color enhanced 'Helvetica,18'  
set style line 1 lt rgb 'red' lw 3  
set style line 2 lt rgb 'green' lw 3  
set style line 3 lt rgb 'blue' lw 3  
set style line 4 lt rgb 'cyan' lw 3  
set style line 5 lt rgb 'violet' lw 3  
set grid 
set key top left 
set xrange [:]  
set yrange [:]  
set xlabel 'Log [Ring diameter (cm)]'  
set ylabel 'Log [Period of ring (seconds)] ' 
set title 'Swinging ring experiment' 
plot [1.6:4.0][-0.75:0.40] './swing_ring_data.dat'     using (log($1)):(log($2)) with points ls 1 ps 0.8 pt 6  t ''   ,  -1.600+0.5*x with lines ls 3 t '-1.60 + 0.5*log(diam)'  ,  -1.400+0.44*x with lines ls 2 t '-1.40 + 0.44*log(diam)'  ,  -1.800+0.56*x with lines lc -1 lw 2 t '-1.80 + 0.56*log(diam)' 
set output 
quit 
