set output 'ism_b.ps' 
set term postscript color enhanced 'Helvetica,18'  
set grid 
set key bot right  
set ylabel 'Extinction, relative to V-band (mag)' 
set xlabel 'Wavelength (Angstroms) ' 
set title 'Extinction in the ISM '
set label 3 at 3.65E3,70 'U' center tc rgbcolor 'blue' 
set label 4 at 5.55E3,70 'V' center tc rgbcolor 'green'  
set label 5 at 8.50E3,70 'I' center tc rgbcolor 'red' 
plot [2500:10000][0.01:3]   './uv_ext.dat' using ($1*1e4):($3)       with linespoints pt 4 ps 1.0 lt 1 lc 3 lw 2 t ''  ,   './uv_ext_2.dat' using ($1*1e4):($3)       with linespoints pt 6 ps 1.0 lt 1 lc 4 lw 2 t ''  
set output 
quit 
