Image cubes, self-calibrated visibilities, and self-calibration and imaging scripts for data associated with Huang et al., 2020, "A multi-frequency ALMA characterization of substructures in the GM Aur protoplanetary disk," The Astrophysical Journal, 891, 48, arXiv:2001.11040 The raw data are available on the ALMA archive under program IDs 2017.1.01151.S and 2018.1.01230.S (PI: Jane Huang). Scripts: reduction_utils.py: Set of helper functions for self-calibration scripts B4continuumreduction.py: Self-calibration and imaging script for Band 4 (2.1 mm) continuum (GMAurB4continuumfinal.image.fits) from GMAurB4continuum.final.ms.tgz B6continuumreduction.py: Self-calibration and imaging script for Band 6 (1.1 mm) continuum (GMAurB6continuumfinal.image.fits) from GMAurB6continuum.final.ms.tgz HCOp_imaging.py: Script producing GMAur_HCOp_continuumsubtracted.image.fits and GMAur_HCOp_withcontinuum.image.fits from GMAurB6_HCOp.ms.contsub.cvel and GMAurB6_HCOp.ms.cvel, respectively Measurement sets: GMAurB4continuumfinal.ms.tgz: Self-calibrated 2.1 mm continuum visibilities for GM Aur GMAurB6continuumfinal.ms.tgz: Self-calibrated 1.1 mm continuum visibilities for GM Aur GMAurB6_HCOp.ms.cvel.tgz: Self-calibrated HCO+ 3-2 visibilities without continuum subtraction GMAurB6_HCOp.ms.contsub.cvel.tgz: Self-calibrated HCO+ 3-2 visibilities with continuum subtraction Images: GMAurB6continuumfinal.image.fits: 1.1 mm continuum image of GM Aur GMAurB4continuumfinal.image.fits: 2.1 mm continuum image of GM Aur GMAur_HCOp_withcontinuum.image.fits: HCO+ 3-2 image cube toward GM Aur without continuum subtraction GMAur_HCOp_continuumsubtracted.image.fits: HCO+ 3-2 image cube toward GM Aur with continuum subtraction