RMS between same samples in different instruments

See first the previous two videos:
Trim Spectra
RMS of subsamples
 

Now we average the repacks and compare the RMS between the samples scanned on different instrument not standardized using the Contrast spectra function of Win ISI. 

Obviously the RMS are higher than the repacks of the samples in one instrument, because we are adding the difference between instruments, but the idea is that after the standardization the RMS of the same sample between two instruments be similar or if possible lower than the sampling error  (RMS between repacks on the same instrument).