In this step you are asked to confirm the starting values of the calibration parameters before Datasqueeze enters the least-squares-fit phase of the optimization. The box displays the starting values of the parameters that will be used in optimizing the detector calibration. In most cases, the user will probably wish to leave them untouched and proceed to the next step. However, if you feel that you have a better idea of what a particular parameter should be, you can enter that value in the appropriate box.
You can also decide not to optimize a particular parameter by checking the box next to that parameter. This is indicated if you are certain that you already know the best value for that parameter, or if you find that in the next step Datasqueeze is unable to accurately optimize that parameter, or if you want to hold that parameter fixed to maintain consistency with some previous data analysis.