Make that 4 problems.

4. If you don't reduce the data as mentioned in #3 of my previous
message, the chart will truncate the data series after 30,000 values.
So you'll need to at least break up the data into blocks of 30,000
points.

Perhaps other people will post here even if they know how to solve just
1 of the 4 problems, and eventually a complete solution may emerge.

Mark