tf_auxiliary tf_battery tf_channel tf_citation tf_comment tf_copyright tf_data_logger tf_data_quality tf_declination tf_diagnostic tf_electric tf_electrode tf_fdsn tf_filter_base tf_filtered tf_instrument tf_location tf_magnetic tf_orientation tf_person tf_provenance tf_rating tf_run tf_software tf_station tf_statistical_estimate tf_survey tf_time_period tf_timing_system tf_transfer_function