Absolute fully entangled fraction from spectrumTapaswini Patro, Kaushiki Mukherjee, Mohd Asad Siddiqui, Indranil Chakrabarty and Nirman GangulyEur. Phys. J. D, 76 7 (2022) 127DOI: https://doi.org/10.1140/epjd/s10053-022-00458-8