Fig. 2From: Optical spatiotemporal vorticesCharacterization of STOV wave packets. a Self-referenced interferometry technique. Adapted with permission from [29], copyright 2020, NPG. b Single-shot supercontinuum spectral interferometry. Adapted with permission from [28], copyright 2019, OPG. c Spatially resolved spectral interferometry. Adapted with permission from [73], copyright 2022, ACSBack to article page