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Table 2

Pitch angle of the spiral arms ARMCF and ARMDE for the different considered tracers as seen from the observer position P1.

Tracer ARMCF ARMDE
NH 10.78° 10.80°
CO (1–0) 10.75° 8.94°
RM 12.98° 13.70°
Syn. 408 MHz 12.83° 12.41°
Dust 870 μm 10.33° 11.86°
Mean ± STD 11.72° ± 1.38° 11.73° ± 2.01°

Notes. Here the arm ARMCF is defined by the tangent points C and F, whereas ARMDE is the local arm of observer P1 with tangent points D and E. Mean values and the standard deviations (STD) are calculated without the angles of NH.

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