Table 3: Sources extension at 3 $\sigma _{\rm noise}$, minor-to-major axis ratio b/a, and position angle (PA; counterclockwise angle relative to the north) for each molecular transition observed. When the emission is almost spherical ( $b/a \geq 0.85$) PA is uncertain and set to 0$^\circ $.
  MM1 MM2 MM3
  Ext. b/a PA [$^\circ $] Ext. b/a PA [$^\circ $] Ext. b/a PA [$^\circ $]
CO (2-1) 72 $^{\prime \prime }$ $\times $ 51 $^{\prime \prime }$ 0.71 +85 34 $^{\prime \prime }$ $\times $ 23 $^{\prime \prime }$ 0.68 -53 45 $^{\prime \prime }$ $\times $ 36 $^{\prime \prime }$ 0.8 +53
H2CO (322-221) 35 $^{\prime \prime }$ $\times $ 30 $^{\prime \prime }$ 0.85 0 35 $^{\prime \prime }$ $\times $ 30 $^{\prime \prime }$ 0.85 0 - - -

CS (2-1)

 97 $^{\prime \prime }$ $\times $ 81 $^{\prime \prime }$ 0.83 +57 75 $^{\prime \prime }$ $\times $ 62 $^{\prime \prime }$ 0.83 -31 - - -
N2H+ (1-0) 89 $^{\prime \prime }$ $\times $ 62 $^{\prime \prime }$ 0.69 +77 55 $^{\prime \prime }$ $\times $ 54 $^{\prime \prime }$ 0.98 0 54 $^{\prime \prime }$ $\times $ 52 $^{\prime \prime }$ 0.96 0
HCO+ (1-0) 104 $^{\prime \prime }$ $\times $ 78 $^{\prime \prime }$ 0.75 +75 57 $^{\prime \prime }$ $\times $ 56 $^{\prime \prime }$ 0.98 0 - - -
H13CO+ (1-0) 52 $^{\prime \prime }$ $\times $ 38 $^{\prime \prime }$ 0.73 -28 <HPBW - - - - -


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