Nigeria's currency isn't as 'free' as we thought it would be

Nigeria finally did the painful thing everyone said it had to do: On June 20, it unpegged the naira from the US dollar and promised to pursue a flexible exchange rate system.
The currency fell by about 30% down to 280 naira per dollar that day, compared to the pegged rate of 197-198 per dollar.
However, one month later, it looks like Nigeria's currency isn't actually as free as was promised last month.
And the best way to see this is to look at a chart.
In a note to clients, John