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- Position: ra,dec of image center
- Size: NAXIS1, NAXIS2 in pixels, from FITS file
- Resolution: sqrt(BMAJ*BMIN), beam axial ratio BMAJ/BMIN of the lowest frequency plane (resolution varies with frequency, most users will convolve to the lowest resolution)
- start time: DATE-OBS from FITS file
- end time: DATE-END from FITS file
- minimum frequency
- maximum frequency
- spectral resolution (spectral channel width (Hz); CRDELT3 CDELT3 in the FITS header)
- project
- polarization types: I
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