t are NULL (-200) everywhere are removed from the data cube. keep_null=True keeps NULL images and keep_null=False removes them.</p></li>
<li><p><strong>read_v4</strong> (<em>boolean</em>) – Whether to read observations with an OBSID starting with 4 (obs table generation v4, mostly for tests and maintenance, see ITN 31).</p></li>
<li><p><strong>display_errors</strong> (<em>boolean</em>) – Whether to show errors that occured in opening individual observations or just to ignore them</p></li>
<li><p><strong