phase correction 

https://doi.org/10.1351/goldbook.08391
Linear combination of the real and imaginary parts of a 1-D nuclear magnetic resonance spectrum to produce peaks with pure absorption mode line shape.
Note:
The phase correction is normally described by the automatic or manual setting of a fixed zero order and a frequency dependent first order phase constant.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 700 [Terms] [Paper]