1. DC2 PSF Status • The function: • 8 bins in energy (2/decade), 6 in cos() (0.1) • Two classes A: GoodEvent3;C: GoodEvent1 && ! GoodEvent3; • Apply scaling function of energy to angular deviations to make the 68% values for approximately 1. (The “Atwood function) • Objective: to find reasonable parametric representation in E and cos of  and 

2. Fits to the function • 8 bins in energy (2/decade), 8 in cos() (0.1) • Two classes so far differ in CTBCORE cut. also (front/back)A: GoodEvent3;C: GoodEvent1 && ! GoodEvent3; • Combine the two data sets • Apply scaling function of energy to make 68% values approximately 1. • Stop fit at 10 (scaled) sigma

3. Class A front: Near normal fits for all energies

4. The parameters: polynomial fits 95%  68% 

5. Angular dependence: mild class A front

6. Clearly energy-dependent What about those Class B guys?

7. Check integral distributions:compare A, C front factor of 2! currently a mystery

8. To Do • Continue checking • Decide on strategy: • Table look-up • Smooth functions