Schematic representation of the production of a wide-slit PV diagram. The cube represents the 3D datacube, with two spatial axes (X, Y) and a velocity axis. A slit over the data is selected (red slice), provided the velocity axis remains intact. In this particular case the Y-axis is conserved. Subsequently, all the emission of the 3D data is collapsed onto the slit, by summing up the intensities with constant (X, v) coordinates.
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