Link between distance in a crow line from Genoa to the provincial
capitals of Piedmont, Lombardy and Veneto and distance along the road:
55,  70, 155, 160, 155, 115, 105, 165, 110, 115,  85, 165, 110, 155, 105
85, 115, 205, 230, 185, 185, 145, 240, 140, 155, 125, 290, 170, 195, 135
linear regression with (0,0) as "fixed point"

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You can open the Code and modify the function: see the Help
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