Negative or zero values cannot be plotted correctly on log charts.Only positive values can be interpreted on a logarithmic ...

Negative or zero values cannot be plotted correctly on log charts.Only positive values can be interpreted on a logarithmic scale. To correct the problem, do one of the following:• Enter only positive values (greater than zero) in the cells used to create the chart.• In the chart, click the axis that you want to change. On the Format menu, click Axis. Click the Scale tab, and then clear the Logarithmic Scale check box.