set y name "I (mA)"
set x name "V (Volts)"

# open data file, plot points
open "635.raw"
read columns x y
close
draw symbol bullet

# plot the theoretical curve 
\xmin="1.664"
\xmax="1.946"
\xinc="(1.946-1.664)/100"
\function = "8.3357*(exp((x-1.633)/0.25786)-1.0)"
create columns from function
draw curve


# create all labels and draw them
draw x axis at bottom
draw y axis at left
draw title "635 nm"