Plot etendue ratio at the pixels across the sensor array plotEtendueRatio(ISA,optimal,bare,zLabel) The etendue ratio between two optics conditions is a measure of the relative optical efficiency between those conditions. This routine takes the two optical conditions, optimal microlens placement and no microlens, and summarizes their etendue ratios in a mesh graph. showing the sensor etendue stored in the ISA structure. The etendue is usually computed using mlAnalyzeArrayEtendue. Copyright ImagEval Consultants, LLC, 2003.