 the header comments in the
package
in order to know how to use it. An example main program is also
provided. Feel free to fit it to your needs.<br>
      <br>
The package contains:<br>
      </span>
      <ul>
        <li><span style="font-family: ms sans serif;">A sample main
program (soflud_test.for)</span></li>
        <li><span style="font-family: ms sans serif;">The function
sfluxd, to retrieve the data of a given date from the mean solar flux data file
(flux_mean.dat),</span></li>
      