An extensive VLT/X-shooter library of photospheric templates of pre-main sequence starsC. F. Manara, A. Frasca, J. M. Alcalá, A. Natta, B. Stelzer and L. TestiA&A, 605 (2017) A86DOI: https://doi.org/10.1051/0004-6361/201730807