The Netc maps show private Beta sites (starting with a 1:) and EPA Beta sites (4:), and for subscribers also the EPA Gamma sites (5: series, one of the 8 bands). The sensors used for measuring Beta and Gamma are different and higher readings for Gamma are expected. See
https://www.netc.com/bb/viewtopic.php?f=6&t=278.
_________________https://netc.com/chart/view.php?n=1%3A919A925A.5 Toronto, Ontario, Canada SBM-20 indoors