› Forums › Spectroscopy › Unable to calibrate a spectrum in ISIS › running without geometric correction
5 October 2018 at 11:42 am
#580057
![](https://britastro.org/wp-content/uploads/2016/11/picture-146-1478110706-80x80.jpg)
Participant
As a further test, the calibration also runs ok with the original X position (though with slightly lower precision and resolution and poor sky background subtraction of course) if you run without the smile correction (by putting a very large value for the radius)