modulation period

in comprehensive chromatography
symbol: $P_{\rm{M}}$
synonym: modulation time
https://doi.org/10.1351/goldbook.09957

Duration of a complete cycle of modulation in a system for comprehensive two-dimensional chromatography.

Note: Modulation period is the length of a second-dimension chromatogram, i.e. the time between two successive injections into the second column.
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 209 (https://doi.org/10.1515/pac-2017-0111)