Signal of sodium from the individual data sets and from an average of the data sets, weighted according to the S/N of the data set. The signals have been scaled to be in units of the standard deviation of the noise. The left column is not binned while the right column is binned every 0.05 Å or 3.8 km s^-1. The binned average signal has a detection S/N = 3.3. The vertical dotted line in all panels indicates a planet rest frame velocity of 0 km s^-1.