 an error will be
raised. Both filenames and open iris_data_cube objects are accepted.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>file_object</strong> (<em>string</em><em> or </em><em>iris_data_cube</em>) – The function accepts either an open iris_data_cube or the path to the
FITS file to assess the lines in the observation.</p></li>
<li><p><strong>description</strong> (<em>string</em>) – Any abbreviation of the line 