Open Access

Table B.4.

Same as Table B.2.

Arm Group p-value Nspiral Retrieved % retrieved Extra % extra
Norma [7, 4] 0.00 56 56 100.00 11 19.64
Sct-Cen [8, 4] 0.47 108 108 100.00 25 23.15
Sgr-Car [2, 6, 5] 0.02 98 98 100.00 35 35.71
Local [0] 0.27 88 88 100.00 24 27.27
Perseus [14, 16, 15, 13, 12, 17] 0.43 341 337 98.83 49 14.37
Outer [1] 0.00 208 208 100.00 113 54.33

Notes. In this test case, random noise is added to the (x,y) coordinates of the stars in the mock spiral arms, and a large number of inter-arms’ Cepheids is included in the sample. The table also indicates the number and percentage of inter-arms’ stars wrongly included in the spiral arms.

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