Table 4: Projected separation of the main IRS 13E sources. From the astrometry the precision on the distance betwen two sources is $\pm $15 AU.
   Sources Ang. sep. Distance (AU)
  E1-E2 0.241 $^{\prime \prime }$ 1930
  E1-E4 0.330 $^{\prime \prime }$ 2630
  E2-E4 0.327 $^{\prime \prime }$ 2600
  E2-E3A 0.200 $^{\prime \prime }$ 1600
E3A-E3B 0.073 $^{\prime \prime }$  590


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