span><span class='op'>(</span><span class='va'>data</span>, <span class='va'>expr</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='fu'>hide_neg_edges</span><span class='op'>(</span><span class='va'>data</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='fu'>show_neg_edges</span><span class='op'>(</span><span class='va'>data</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='fu'>colour_neg_edges</span><span class='op'>(</span><span cla