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Punzo et al. (2015) recently reported on the state of the art forvisualisation of H I data cubes. I here briefly describe another program,FRELLED, specifically designed for dealing with H I data. Unlike many 3Dviewers, FRELLED can handle astronomical world coordinates, easily andinteractively mask and label specific volumes within the data, overlay opticaldata from the SDSS, generate contour plots and renzograms, make basic spectralprofile measurements via an interface with MIRIAD, and can switch betweenviewing the data in 3D and 2D. The code is open source and can potentially beextended to include any astronomical function possible with Python, displayingthe result in an interactive 3D environment.

Comment on 'The role of 3-D interactive visualization in blind surveys of HI in galaxies'