Greater speed in the radial direction: the overall speed could be smaller, unchanged or greater.
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Depends on the gradient or slope of the lines.
The formula for the slope of a line in mathematics is m = y2 - y1/x2 - x1. The slop of the line describes the steepness so a higher value slope means a steeper slope.
makes line steeper or flatter
it is less dense
Steeper