# Constants $C_1$ to $C_7$ of multi-layer backfill

Symbol
$C_{q}$
Related
$R_{CG}$
Choices
ConstantValue
$C_1$0.01417
$C_2$0.2095
$C_3$0.1827
$C_4$0.9092
$C_5$0.2822
$C_6$1.188
$C_7$0.2732