/span>
<span id="cb6-20"><a href="#cb6-20" aria-hidden="true" tabindex="-1"></a>                                                               alpha_cov,</span>
<span id="cb6-21"><a href="#cb6-21" aria-hidden="true" tabindex="-1"></a>                                                               abundance,</span>
<span id="cb6-22"><a href="#cb6-22" aria-hidden="true" tabindex="-1"></a>                                                               covariates){</span>
<span id="cb6-23"><a href="#cb6-23" aria-