lue (<code>pval.intercept</code>). All these parameters are also reported for the regression
slope (<code>DIFestimate</code> etc.). Additionally, model aic value (<code>AIC</code>) and
the optimised value (<code>optpar</code>) of the phylogenetic parameter 
(e.g. <code>kappa</code> or <code>lambda</code>, depending on the phylogenetic model used) 
are reported.</p>
<p><code>null.dist</code>: A data frame with estimates for the null distributions
for all clades analysed.</p>
<p><code>data</code>: Original fu