sfgraph belongs to the family of plotting programs and is used for plotting explicitly defined 2-D curves.

8. The displayed function can be changed from $Y(X)$ to $X(Y)$ by using transp= parameter. The following plot from jsg/nmo3/azimuthtest is created with transp=y yreverse=y symbol=+ symbolsz=4.
9. The ranges of $X$ and $Y$ are selected automatically but can be controlled with min1=, max1=, min2=, max2=.