The data in table below have been measured for the growth of crystals of an antibiotic. From the data, obtain the expression for the relationship between $d\frac{L}{d}t$ and the supersaturation c$-$c$*.$

$\backslash$table$[[$c$-$c$*$ gram$/$liter$),d\frac{L}{d}t($micrometer$/$minute$)],[0\mathrm{.}20,0\mathrm{.}21],[0\mathrm{.}35,0\mathrm{.}45],[0\mathrm{.}67,0\mathrm{.}90],[1\mathrm{.}25,1\mathrm{.}80],[2\mathrm{.}05,3\mathrm{.}30],[2\mathrm{.}75,5\mathrm{.}00]]$