Spells per Day

At the indicated levels, a vindicator gains new spells per day as if he had also gained a level in a divine spellcasting class he belonged to before adding the prestige class. He does not, however, gain other benefits of that class other than spells per day, spells known, and an increased effective level of spellcasting. If he had more than one divine spellcasting class before becoming a vindicator, he must decide to which class he adds the new level for the purpose of determining spells per day.