Salary of Legionaires

From the years of Julio Caesar to the end of the I Century AD we have an idea of how much a legionaire was paid. A simple soldier was paid 225 silver Denarii every month, about 1200 €. It is not clear how much an officer was paid but it seems that the salary was double: 450 silver Denarii, about 2400 €.
The equites should earn one time and half the pay of a legionaire: 337,5 silver Denarii (about 1800 €). We are quite sure about the salary only for the Equites principales. For the other equites ranks we have no reliable evidences.