1. ABI Power SYBR® Green primer efficiency? - (Mar/25/2007 )

What is the range of SYBR primer efficiency? What about 90 - 110% (-3.6 > slope > - ­3.1)? Any requirement of R2 of the standard curve? Anyone knows this? Thank you in advance.

Late reply, but nevertheless:
Efficiency: 95 - 105%
R² < 0.99