advertised bandwidth graph could better represent short horizon change

Fifty Quintex relays went offline at 2/16/2019 07:03 UTC and advertised bandwidth for exit and exit+guard relays dropped 9.1% from 11457731000 to 10412355000; remained there for over one day. According to

https://metrics.torproject.org/bandwidth-flags.png?start=2019-02-14&end=2019-02-18

nothing happened.