Extended Data Figure 2: Slices of the data for the nuclear emulsion plates.
From: Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons
Each panel shows slices for tanθy every 0.25 units (in tangent) and separated into four ranges at 0 ≤ tanθy < 1 (see Fig. 2a–d). The top part of each panel shows muon flux distribution and the bottom part of each panel shows the difference of muon flux. In the top part of each panel, the red line shows the data, the black solid line shows the simulation with the internal structures, and the grey dashed line shows the simulation without any internal structure. In the bottom part of each panel, the red line shows the subtraction between the data and the simulation with the internal structures, and the black line shows subtraction between the simulation with and without the internal structures, so that the Grand Gallery appears as a muon excess. Error bars indicate statistical error of 1σ (standard deviation). The comparison between the excess that corresponds to the Grand Gallery and the one that corresponds to the new void shows that the two structures are of a similar scale. For each projection of difference of muon flux, we performed a Gaussian fitting to estimate the direction of anomalies. The fitting zone was 0 ≤ tanθx ≤ 0.2 for position NE1 and −0.2 ≤ tanθx ≤ 0 for position NE2. These fitted centres were used for the triangulation.
