Do a brute curve fitting to obtain

$d\frac{}{d}n=1\mathrm{.}544{10}^{-2}-5\mathrm{.}7907{10}^{-4}n$

$+5\mathrm{.}9344{10}^{-5}{n}^2-1\mathrm{.}9244{10}^{-6}{n}^3$

$+1\mathrm{.}2349{10}^{-8}{n}^4-1\mathrm{.}2072{10}^{-4}{n}^5$

Try to obtain a similar expression in Matlab & Excel $($In

Matlab use polyfit function$).$