I rejected 12, 15 &16 I later put 12 back in because a very worn v-nickel hit 12. Pk1 got rid of the pulltabs on top but also the row of relics below it. Pk2 still got rid of two pull tabs while two became iffy signals. What I found very interesting is the amount of relics that moved down into the accepted range. There really is a difference in the way the freqiencies are weighted to hit different targets better.