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PLOT procedure (was: Julian Day Numbers)

One real gotcha with Julian day numbers is if you try to use them for a 
time axis on a plot.

It works fine for long time axes, but if you try looking at high-resolution 
data things look really messy.

The problem is that PLOT converts to single-precision before converting 
coordinates to data and this means that all values are truncated to the 
nearest quarter day (for IEEE floats).

James

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+------------------------+-------------------------------+---------+
| James Tappin           | School of Physics & Astronomy |  O__    |
| sjt@star.sr.bham.ac.uk | University of Birmingham      | --  \/` |
| Ph: 0121-414-6462. Fax: 0121-414-3722                  |         |
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