NAME: SYMBOLS PURPOSE: Create custom plotting symbols CALLING SEQUENCE: SYMBOLS,SYMBOL_NUMBER,SCALE INPUTS: SYMBOL_NUMBER: 1 = open circle 2 = filled circle 3 = arrow pointing right 4 = arrow pointing left 5 = arrow pointing up 6 = arrow pointing down 7 = arrow pointing up and left (45 degrees) 8 = arrow pointing down and left 9 = arrow pointing down and right. 10 = arrow pointing up and right. 11 through 18 are bold versions of 3 through 10 19 = horizontal line 20 = box 21 = diamond 22 = triangle 30 = filled box 31 = filled diamond 32 = filled triangle SCALE - size of symbols. KEYWORD PARAMETERS: COLOR - color of symbols SIDE EFFECTS: The desired symbol is stored in the user buffer and will be plotted if !P.PSYM = 8. MODIFICATION HISTORY: Jeff Bennett, U of Colorado, 198?