The csv files starting with "fig" contain the data displayed in the figures. The file "data_all.csv" contains the data from all experimental repetitions that contribute to the data presented in the manuscript, labelled by "image number". The main measurement series is organized in seven measurement scenarios, described in extended data figure 3, which differ by the applied Rabi pulse sequence for mode coupling after TMSV creation: * 1: no Rabi pulses (Twin-Fock states; not used in the manuscript except for the histograms of non-quantized data) * 2: two pi-pulses, but no coupling pulse (Twin-Fock states) * 3-6: small rotations, i.e. short coupling pulses * 7: pi/2-pulse for mode coupling, i.e. HOM coupling (Holland-Burnett states)