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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2014 Sep 27;25(12):2048–2059. doi: 10.1007/s13361-014-0981-1

Table 2.

Results of linear regression as described in the Results and Discussion section. Values of α are consistent across instruments that were recently calibrated, while the two instruments that were not calibrated immediately prior to the experiments had different values (as noted by *). The magnitude of σO2 is small compared to other terms in Eq. (6). Regressions were obtained with R2 > 0.96 in all cases.

Instrument α σO2 R2
Velos 1 1.32 0.0007 0.997
LTQ 1 1.38 0.0005 0.965
IF-LTQ 1 1.29 0.0002 0.994
Velos 2 1.16 0.0001 0.997
LTQ 2 1.81* 0.0006 0.999
IF-LTQ 2 0.994* −0.0011 0.992