You two have the right solution. At the risk of self publicizing, I like to use my wrapper programs oplot_horiz.pro and oplot_vertical.pro and just pass in the vectors of any length of where you want the lines. http://people.bu.edu/balarsen/IDLdoc/oplot_horiz.html http://people.bu.edu/balarsen/IDLdoc/oplot_vertical.html Cheers, Brian -------------------------------------------------------------------------- Brian Larsen Boston University Center for Space Physics http://people.bu.edu/balarsen/Home/IDL
