Chandra light curves for CXOHDFN J123639.5+621230 and CXOHDFN 123643.9+621249 in the full band and soft band, respectively. The mean count rate is shown for each of the six observations composing the Chandra data set; the first four observations are those listed in Table 1 of H01, and the last two are those described in § 2. The exposure times vary substantially from observation to observation, and the time gaps between the observations vary. Error bars have been calculated following Gehrels (1986).