Image Details
Caption: Figure 1.
Sky maps in an orthographic projection centered on the north celestial pole, showing the CHIME FRB sample (CHIME/FRB Collaboration et al. 2026), colored by their extragalactic DMs in the upper panel, alongside the SDSS void catalog (Q. Mao et al. 2017), colored by their effective void radius in the lower panel. Dashed grid lines mark declinations of 30°and 60°, and R.A. intervals of 60°.
© 2026. The Author(s). Published by the American Astronomical Society.