I’m trying to convert a CodeV seq file into OpticStudio.  Everything converted successfully except for the diffractive surface.  ZOS made the surface a Binary 2, but no coefficients were translated.  I’ve tried to find a reference for how CodeV defines their diffractive surface, but was unsuccessful in my search.  In the snip from the seq file below, I need to figure out what A and B coefficients are and also what the HCO C1 and C2 are. 

S     162.967 46.58723622430936 AIR
  THC 0
  SLB "L12.2"
  CIR 28.5
  CIR EDG 31.0
  ADX EDG 0.0
  ASP
  K   -1.826
  CUF 0.0
  A   0.6605800000000001e-7; B -0.23953e-12; C 0.0; D 0.0
  DIF HOE
  HV1 REA; HV2 REA
  HOR 1.0; HTH 0.0; HIN 0.0; HDI 0.0
  HSW 0.0; HDN 0.0
  HX1 0.0; HY1 0.0; HZ1 0.0
  HX2 0.0; HY2 0.0; HZ2 0.0
  HWL 4250.0; HCT R
  HCO C1 -0.3795800000000001e-4; HCC C1 100; HCO C2 0.20705e-8; HCC C2 100

Thanks in advance for any help you can provide.