Sounds like the Refine option is not checked. Please look at the example file we just uploaded for the volcano data set. The first graph does not have refine checked and you can see each grade location.
The subsequent graphs have the refine option turned on which smooths the grid. There are also contours and a color ramp.
It would be great to confirm that what you’re seeing in DataGraph matches the images I uploaded. I would also recommend checking to see if the refine box is selected in your image.
If the file we posted looks OK to you and the refine checkbox is selected in your file, you might want to send a file to us with this problem. Go under the Help menu within DataGraph and select the option to email us.