Debye length squared is scanned across scale and density ratios. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Shielding length squared is scale divided by density
The checked source keeps density six and scale squared eighteen, so lambda squared is three square meters.
λ2=618=3
Density and scale pull lambda squared in opposite ways
The first two rows hold scale fixed while density rises. The last row raises scale at the same density.