Can I get some detailed explanations and answer for this question? Also, I'm a bit confused with graphing, so could you please label the graph and explain?

In June 2016 a referendum in Britain to leave the European Union unexpectedly passed. The next day, the pound depreciated from $1.45 to $1.30. There was no change in interest rates in the US or the UK. What could explain this depreciation of the pound when interest rates did not change? Use a diagram of the FX market in your answer, with the UK as the domestic country, and label the axes correctly