How i can get the best point after fitting to use it

x= 1:100 (minutes)
y= 100 value

if i make fitting for x,y how i can get only 10 best point

[dpb]

For what definition of "best"? The individual points with smallest residuals, the contiguous ten with smallest residual, ten that span a fixed percentage of the input range or what of any number of alternatives? What's the end purpose might help answer the question.