LINE2 is similar to line but, when connecting points, when the distance between two x values is larger than ddx, does not plot the connecting line.
CALL LINE2 (x,y,n,k,j,l,ix,iy,xm,dx,ym,dy,ddx) x (R): array containing the x coordinates y (R): array containing the y coordinates n (I): number of data points in x and y (the number of data points in x, y should be equal) k (I): plot every first (k=1), second (k=2) value etc (normally k=1) j (I): plotting symbol spacing flag > 0 : symbol is plotted at every jth plotted point connected by lines = 0 : no symbols, lines only < 0 : symbol is plotted at every abs(j)th plotted point with no connecting lines l (I): plot symbol number (see SYMBOL) ix,iy (I): starting indexs in array (normally ix,iy=1) xm (R): minimum value scale factor for x array dx (R): increment scale factors for x array ym (R): minimum value scale factor for y array dy (R): increment scale factors for y array ddx (R): distance threshold for x