Projected separation of water maser positions relative to the continuum source vs. the MJD at which the masers were detected. The blueshifted masers detected between 59600–59750 and 60100–60200 are fitted with a line, given that these masers resemble outward motion. Their origin at r = 0 could be at ∼59000, but with very large uncertainty. Not all masers appear on this plot, particularly those with positions >0﹩\mathop{.}\limits{^{\prime\prime} }﹩25 from the continuum source.