Table 2 Positions of the detectors and coordinates of reference points in the reference system used in the paper (in meters).

From: Hidden chamber discovery in the underground Hellenistic necropolis of Neapolis by muography

ID

X

Y

Z

VP1

−1.66

1.76

−18.2

VP2

0.26

4.92

−18.2

x1

−4.19

7.18

−9.0

x2

−2.09

6.36

−8.0

x3

−2.44

4.43

−8.0

x4

−4.48

4.61

−9.0