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    <h1>Get group names for a class <code>Zvariant</code> instance.</h1>
    <small class="dont-index">Source: <a href='https://github.com/cbig/zonator/blob/master/R/AllGenerics.R'><code>R/AllGenerics.R</code></a>, <a href='https://github.com/cbig/zonator/blob/master/R/ZGroupCurvesDataFrame-methods.R'><code>R/ZGroupCurvesDataFrame-methods.R</code></a>, <a href='https://github.com/cbig/zonator/blob/master/R/zresults-methods.R'><code>R/zresults-methods.R</code></a>, and 1 more</small>
    <d