t1 noise 

in two-dimensional nuclear magnetic resonance spectroscopy
Synonym: t1 noise in 2-D NMR
https://doi.org/10.1351/goldbook.08431
Streaks of spurious artefact signals in a two-dimensional nuclear magnetic resonance spectrum parallel to the f1 axis at the f2 of a strong resonance.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 708 [Terms] [Paper]