I am using the following data series for a scatterplot and I am not getting
any major (or minor) horizontal gridlines automatically (or manually setting
the axis major and minor points). Any thoughts?

I'm using Office 2007

Thanks,
Ben


umol ATP/mL assay absorbance
0 0.0295
8.95E-23 0.0775
1.79E-22 0.1415
2.69E-22 0.1805
3.58E-22 0.2285
4.48E-22 0.266