+ root->add_child("SamplesPerPoint")->add_child_text (raw_convert<string> (_samples_per_point));
+ root->add_child("SampleRate")->add_child_text (raw_convert<string> (_sample_rate));
+
+ if (_leqm) {
+ root->add_child("Leqm")->add_child_text(raw_convert<string>(*_leqm));
+ }
+