The data is acquired using a 2m-long magnetic bottle electron spectrometer. An acceleration voltage of 2V is applied on the permanent magnet and  the gas needle and a retarding potential of 34V is applied at the entrance of the flight tube. The design of the MBES is based on the following publication: J. H. Eland et al., Phys. Rev. Lett. 90, 053003 (2003).

The experiments consist in measuring time-of-flight spectra as a function of the delay between the attosecond pulse train and the IR probe field.

spectrogram.txt is a matrix (41x5001), where each row corresponds to the time of flight spectrum of the photoelectron for a given delay. The values in this matrix correspond to the number of electrons detected for a given delay (rows) and time-of-flight (columns). 
spectrogram.txt contains the number of electron counts as a function of time-of-flight and delay between the attosecond pulse train and the infrared field.

delay.txt is a vector containing  41 entries corresponding the values of the delay in femtoseconds.
delay.txt contains the value of the delays used in the experiment in fs.

TOF.txt is a vector containing 5001 entries corresponding to the values of the electron time of flight in nanoseconds.
TOF.txt contains the value of the electron time-of-flights in ns.

To calculate the electron kinetic energy based on the time of flight the following information is need:
- the length of the flight tube is approximately 2 m
- an acceleration voltage of 2 V was applied to the gas needle and permanent magnet
- a retarding voltage of 34 V was applied at the entrance of the flight tube

In kinetic energy, consecutive photoelectron peaks should be equally spaced by approximately 1.55 eV.