Demo code for the paper Schlieren and BOS velocimetry of a round turbulent helium jet in air* The link to the paper: https://arxiv.org/abs/2202.04122 Schlieren and BOS velocimetry of a round turbulent helium jet in air by Gary S. Settles and Alex Liberzon see also the data on Zenodo: https://zenodo.org/record/6136052#.YjOJgXpBzcs