Crystal Reports X Axis Scale on Surface Chart

Message

   If the x axis values are different for each line on a 2D line graph, you 
right click the chart,
click options,
click grid,
click group axis,
click the radio button 'show numeric scale'.

Then the chart scales the x axis properly, even though the 'Offsets' are not equal intervals.

How can you do this on a surface chart??

I do not see the same options.

Section  Offset  Elevation
0                0           650
0              10           675
0            100           705
etc

100            0           650
100          50           670
100        100           690
etc

Thanks