set output './lmc_ceph_pl_i_line.ps' 
set term postscript enhanced color 'Helvetica,18'  
set style line 1 lt rgb 'red' lw 3  
set style line 2 lt rgb 'sea-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 style line 6 lt rgb 'black' lw 3  
set grid 
set key top left 
set ylabel 'Log_{10} [I-band luminosity (solar units) ]' 
set xlabel 'Log_{10} [Period (days) ]' 
set title 'Cepheids in the LMC, I-band '
plot [0.2:1.5][2.4:4.0] './lmc_ceph_corr_fund.dat' using      (log10($5)):(log10($13))      with points ls 1 ps 0.8 pt 6     t ''  ,   2.25+1.2*x ls 6 t 'slope = 1.2'  
set output 
quit 
