tokens: ACKNOWLEDGEMENTS TEEO gratefully acknowledges funding from the Vermont Space Grant Consortium. The authors wish to acknowledge Ben Stappers for providing timing solutions for some pulsars and Joel Weisberg for providing ionospheric rotation-measure estimates. Portions of this work were carried out with support from US National Science Foundation grants AST 0968296 and 1814397. DM acknowledges funding from the grant ‘Indo-French Centre for the Promotion of Advanced Research – CEFIPRA’. The National Astronomy and Ionosphere Center (also known as Arecibo Observatory) is operated by the University of Central Florida under a cooperative agreement with the US National Science Foundation, and in alliance with Yang Enterprises and the Ana G. Méndez-Universidad Metropolitana. This work made use of the NASA ADS astronomical data system.
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