' sign.
The first column is called column 1.  Whether this format is used or the
`<font color="#82140F"><code>*</code></font>' format is a matter of choice, except that numbered format also
permits using a given number to fill several variables (for example
`<font color="#82140F"><code>read columns x=1 y=2 u=1 v=2</code></font>').
<p>

<li> `<font color="#82140F"><code>read columns x="netCDF_name" ...</code></font>'
If the file is a `<font color="#82140F"><code>netCDF</code></font>' file, opened
by e.g. `<f