Variable sizeFlyMods`Const`

sizeFlyMods: {
    col: -8;
    dim: 6;
    fine: 8;
    grg: -6;
    huge: -4;
    lg: -2;
    med: 0;
    sm: 2;
    tiny: 4;
} = ...

The size modifier applied to fly checks of creatures not of medium size