You can run the following macros to set the limits on the x-axis. This kind of x-axis is based on a count, i.e. just because the first column is labeled some number, it is still 1 on the axis scale. Ex. If you want to plot columns 5 through 36, set 5 as the x-axis minimum, and 36 as the x-axis maximum.
the following excel restrictions per worksheet apply: 1  excel 2003: can handle 65k rows. 2  excel 2007 (and later): can handle 1M rows.
This answer, though it does in fact provide most of the information, indicates the limitations of Excel, and not of the supported file formats xls or xlsx. The limitations of xls is still 256 columns and 65536 rows, if you use that file format in a newer Excel version.