How does the fixed keyword work

https://drive.google.com/open?id=0B-hCHfb-ZFFfN0l0b1NtOFp3N0E

Digital Camera Resolution Measurement Using Sinusoidal Siemens Stars

https://drive.google.com/open?id=0B-hCHfb-ZFFfU2d5YTlzNzdvN0E

Evaluating Digital Cameras

https://drive.google.com/open?id=0B-hCHfb-ZFFfX2Y5ckZKdG5qNXc