set output 'calib_target_a.ps' 
set term postscript color enhanced '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 grid 
set key top right 
set ylabel 'V-band magnitude' 
set xlabel 'Julian Date - 2457100 ' 
set title 'Light curve of variable star'
plot [97.69:97.91][14.5:10.8] 'instr_mag.dat' using ($1-2457100):($4+11.339)       ls 3 pt 3 ps 0.3 t 'C'  
set output 
quit 
