It was not mentioned in the paper which standard electrode caps were used and there was an error in the definition of one standard layout. Hence, I will provide this information in the following.

For 19 electrodes we used the electrodes:
['Fp1', 'Fp2', 'F7', 'F3', 'Fz', 'F4', 'F8', 'T7', 'C3', 'Cz', 'C4', 'T8', 'P7', 'P3', 'Pz', 'P4', 'P8', 'O1', 'O2']

For 62 electrodes we used the electrodes:
['Fp1', 'Fp2', 'F7', 'F3', 'Fz', 'F4', 'F8', 'T7', 'C3', 'Cz', 'C4', 'T8', 'P7', 'P3', 'Pz', 'P4', 'P8', 'O1', 'O2', 'FC5', 'FC1', 'FC2', 'FC6', 'TP9', 'CP5', 'CP1', 'CP2', 'CP6', 'TP10', 'PO9', 'Oz', 'PO10', 'AF3', 'AF4', 'AF7', 'AF8', 'C1', 'C2', 'C5', 'C6', 'CP3', 'CP4', 'CPz', 'F1', 'F2', 'F5', 'F6', 'FC3', 'FC4', 'FT10', 'FT7', 'FT8', 'FT9', 'P1', 'P2', 'P5', 'P6', 'PO3', 'PO4', 'PO7', 'PO8', 'POz']
This is a full cap with 64 electrodes, where 'TP7' and 'TP8' were used for EMG recording instead and removed for the analysis in this paper.

For 33 electrodes we used the electrodes:
['Fp1', 'Fp2', 'F7', 'F3', 'Fz', 'F4', 'F8', 'T7', 'C3', 'Cz', 'C4', 'T8', 'P7', 'P3', 'Pz', 'P4', 'P8', 'O1', 'O2', 'AFz', 'FT7', 'FC3', 'FCz', 'FC4', 'FT8', 'TP9', 'TP7', 'CP3', 'CPz', 'CP4', 'TP8', 'TP10', 'Oz']
Note that this is NOT the standard setting from the actiCAP system that we used. I do not know, where we got this setting from. Furthermore, it includes the ground electrode AFz, the reference electrode FCz, and the two replaced electrodes 'TP7' and 'TP8'. These 4 electrodes could not be selected. Hence for the results, this cap corresponds to a setting with 29 electrodes instead of 33 electrodes.