Thanks Villeroy. Changing to and X-Y Scatter did the trick. After changing the chart type I was able to manipulate the scale on the X-axis. Initially, however, the data from the X-axis was blanked for some reason. Instead of having my dates (which were my X-axis data) along the X-axis, there merely were ascending number values (1-140 for each of my 140 data points). However, after going to Data Ranges, under the Format menu, and then selecting the Data Series tab, I was able to manually enter the data range for the Range for X-values, which solved the problem. Thanks for your help. I do wonder, though, why the scale on the X-axis is not manipulatable in a line-chart. Is this a flaw in the program? P.S., how did you know that switching to an X-Y Scatter would help? Thanks again.
windows XP, OOo 2.4