**Acknowledgements**

This work has been funded by project number RTI2018-097633-A-I00 of the Spanish Ministry of Universities, Science and Innovation, entitled "Photonic restoration applied to cultural heritage: Application to Dali's painting: Two Figures."

The authors also want to thank Jorge García and Carmen Muro from Museo Nacional Centro de Arte Reina Sofía for their fundamental considerations in the state of conservation of the Dalí painting. The authors would like to acknowledge Dra. Natalia Mora López for her selfless support in the English revision.
