void psppire_means_layer_clear (PsppireMeansLayer *ml);
GtkTreeModel *psppire_means_layer_get_model_n (PsppireMeansLayer *ml, gint n);
void psppire_means_layer_clear (PsppireMeansLayer *ml);
GtkTreeModel *psppire_means_layer_get_model_n (PsppireMeansLayer *ml, gint n);