 and/or backward projections this way.</span></div><div  class = 'S1'><span>You'll need to run the </span><a href = "https://github.com/villekf/OMEGA/blob/master/source/index_maker.m"><span>index_maker.m</span></a><span> as specified to get the necessary subset indices. The line </span><span style=' font-family: monospace;'>[gaussK, options] = PSFKernel(options);</span><span> is only applicable if PSF reconstruction is used as it creates the PSF kernel gaussK.</span></div><div  class = 'S1'><span>To use you