ner_tags: O O O B-Person I-Person O O O O O O B-Telescope O B-Person I-Person O O O O O O O O O O O O O O O O O O O O O O O O O B-Organization I-Organization I-Organization O O O B-Grant B-Person O O O O B-Grant O O B-Location B-Organization I-Organization I-Organization B-Person O O O B-Organization B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O O O O O O O B-Collaboration I-Collaboration I-Collaboration I-Collaboration B-Collaboration O O O O B-Observatory I-Observatory I-Observatory O O O O B-Organization I-Organization O O O O O O B-Organization I-Organization I-Organization
tokens: We gratefully thank J. Zhao for providing his inversion results from HMI data, T. Hartlep for providing his meridional flow simulation data, and an anonymous referee for an excellent numerical suggestion. This material is based upon work supported by the National Science Foundation under Grant Number 1351311. A.S. acknowledges support from grant FA-F02-F028 of the Uzbek Academy of Sciences. S.K. was supported by NASA’s Heliophysics Grand Challenges Research grant 13-GCR1-2-0036. This work utilized data obtained by the Global Oscillation Network Group (GONG) program, managed by the National Solar Observatory, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation.