Base penetration values Base penetration values are defined using a precomputed table and linearly interpolated with respect to range. Here are plots (re-rendered using higher resolution and different linestyles than the first time): These do not include modifiers from gun Mark (between 0.935x to 1.33x; there's also a slight additional dependence on diameter but this is negligible), nor penetration modifiers from techs/components. But these affect all shells close to proporti