loop_ _nef_spectrum_dimension.dimension_id _nef_spectrum_dimension.axis_unit _nef_spectrum_dimension.axis_code _nef_spectrum_dimension.spectrometer_frequency _nef_spectrum_dimension.spectral_width _nef_spectrum_dimension.value_first_point _nef_spectrum_dimension.folding _nef_spectrum_dimension.absolute_peak_positions _nef_spectrum_dimension.is_acquisition 1 ppm 1H 500.0 13.312 11.428 circular true true 2 ppm 13C 125.7367377 203.600 201.80 circular true false 3 ppm 1H 500.0 13.312 11.428 circular true false