SUBROUTINE LGRID

 LGRID plots a  logarithmic or linear  grid using solid lines, dotted lines, or ticks. See also GRID.

CALL LGRID (x,y,dx,dy,nx,ny,i)

x,y   (R): location coordinates for the bottom-left corner of grid
dx,dy (R): spacing of major grid lines in x and y directions
nx    (I): number of major grid lines in x direction
           < 0 : log spacing of minor lines
           > 0 : no minor lines/ticks
ny    (I): number of major grid lines in y direction
           < 0 : log spacing of minor lines
           > 0 : no minor lines/ticks
i     (I): option flag
           = 0 : solid major/minor lines
           = 1 : dotted major/minor lines
           = 2 : solid major lines with minor ticks