<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def burnin(self, n):
 """Remove the earliest n ensemble members from the MCMC output"""

        self.sediment_rate = self.sediment_rate[:, n:]
        self.headage = self.headage[n:]
        self.sediment_memory = self.sediment_memory[n:]
        self.objective = self.objective[n:]