Figure 2 replots it as a log graph. The actual data are the solid lines  and all the way back to Day 0 now. You can also just about see dotted lines alongside each country's solid line  more on this later.
Log scales are great for exponential growth. They appeared often in the media, but surfaced just twice in the Briefings – on 29 April and 6 May.
Now for those dotted lines... they're straight, and because it's a log scale, straight lines show constant daily percentage changes in infections, e.g. D's dots plot a constant 70% increase in infections every day  and A's dots plot a constant 25% increase a day.
And lo, from about Day 12, D's solid line starts to dip under its dotted line  hence its daily increase in infections moves down from 70%. It's making inroads into the spread of infection. A is worsening though – its solid line moves over its dotted line, so its daily increase in infections moves up from 25%. Log graphs help us compare exponential changes.
But it's still not ideal. Readers must squint at gaps between a country’s solid line and dotted line  and that's neither that easy nor intuitive. But what to do instead?
