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Phase diagrams for the non-negative spikes image class and LP reconstruction. DT phase diagrams (a,b) and ALMT phase diagrams (c,d). Gaussian sensing matrices (a,c) and fan-beam CT system matrices (b,d). Theoretical phase-transition curves for Gaussian sensing matrices (red), empirical phase-transition curve at 50% contour line (cyan), and 5% and 95% contour lines (yellow and magenta).
