I was flipping through my copy of N. Richard Werthamer's "Risk and Reward: The Science of Blackjack" last night and I came across a table of system tag values which included the following entries:
Tags for (Ace, 2, 3, 4, 5, 6, 7, 8, 9, Ten)
Halves I: -1.5, +1, +1, +1, +1.5, +1, +0.5, 0, -0.5...