This is from a book
GraphicsGrid[{{g11a, Show[
Plot[1.25`-0.5590169943749475` Sqrt[5.`-16.` Re[y]],{y,-3.3, 0.3125},
PlotRange-> All, Ticks->{ {-3, -2, -1},{-3, -2, -1, 1, 2, 3}}],
Plot[1.25`+0.5590169943749475` Sqrt[5.`-16.` Re[y]],{y,-0.3,0.3125}],
AspectRatio-> 1, AxesLabel-> {"\[CapitalDelta]N/\[CapitalDelta]t","N"},
Epilog-> {Circle[{0,0},{0.06, 0.1}], Disk[{0,2.5},{0.06, 0.1}], Arrowheads[0.06],
Arrow[{{0,3},{0,2.7}}], Arrow[{{0,0},{0,2.2}}], Arrow[{{0,0},{0,-3}}]}]}}]
There are many backticks. Does the author use backticks to reserve the computer space to insure the machine precision for these numbers? What is wrong if he does not use backticks?
Thanks a lot.