classSavingThrowFormulas: {
    base: { high: "2 + floor(@hitDice / 2)"; low: "floor(@hitDice / 3)" };
    custom: { high: "0"; low: "0" };
    mythic: { high: "0"; low: "0" };
    npc: { high: "2 + floor(@hitDice / 2)"; low: "floor(@hitDice / 3)" };
    prestige: {
        high: "floor((1 + @hitDice) / 2)";
        low: "floor((1 + @hitDice) / 3)";
    };
    racial: { high: "2 + floor(@hitDice / 2)"; low: "floor(@hitDice / 3)" };
} = ...

The formulae for saving throw progressions by class type