set output './color_term_b_fit.ps' set term postscript color enhanced "Helvetica,18" set grid set nokey set xlabel 'instrumental magnitude color (b - v) ' set ylabel '(instrumental b) - (Johnson B) ' set title 'Photometry of PG1633 field ' plot [0.8:3.0][2.4:3.0] 'pg1633_compare.dat' using ($9-$12):($9-$8):($10) with yerrorbars lc 3 pt 5 ps 2.0 lw 4 , 2.3446+0.1851*x with lines lt -1 set output quit