For a few different approaches see
Select Markers
http://www.tushar-mehta.com/excel/ne...ers/index.html

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Custom business solutions leveraging a multi-disciplinary approach


"warrenrob50" wrote:

I just want to make the suggestion that you should be able to graph every
n-th data point in a set of data on a scatter plot. I have a set of data
with thousands of points, and I have a model prediction to match. The best
way to differentiate between a set of data and model prediction and
experimental data is to make the expermental data points on the graph and
make the model predictions a solid line. If you have many expermental data
points on a graph, the data looks like a solid line no matter what you do to
it.

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