If I have 8 spectrometers together placed at different collection angles like looking a single point in a well at different locations . For the specific purpose I have to record signals from that single plasma from 8 different spectrometers placed at different locations with respect to laser plasma. In my present condition the spectrometers are not calibrated but I doubt even I calibrate it, it looks difficult to synchronize all. The reason of using 8 spectrometer because of having short spectral range 200 to 250, 250 to 300, 300 to etc.. upto 900 nm. and thus to frame spectrum in single picture all the spectrometer is placed at different angles, all the recorded spectrum is merged in a frame but the final spectrum is not true representation because one range spectra is not calibrated in the same way to other. The two atomic lines of different spectrometer can not be used for temperature estimation. What is best way to synchronize all the spectrometer together and get result such a way that whole spectral range data which is joined in one frame and get correct spectral data.