we were able to detect how many times the exchange rate between two currencies is related to trends in interest rates in their countries. in particular, the yield spread between German and U.S. government with a maturity of two years (pink line in the graph, left scale) has proved useful in interpreting the trend of the exchange rate between euro and dollar (blue line, scale right).
an extra measure of reading is the intersection of the said differential with its moving average at 10 weeks, intersection that seems to sanction i'inizio of a new phase in favor of the dollar