Spectral analysis of molecular resonances in erbium isotopes: Are they close to semi-Poisson? Kamalika Roy, Barnali Chakrabarti, N. D. Chavda, V. K. B. Kota, M. L. Lekala and G. J. Rampho EPL, 118 4 (2017) 46003 Published online: 27 July 2017 DOI: 10.1209/0295-5075/118/46003