Charge-dependent spectral softenings of primary cosmic rays below the knee - Francesca Alemanno; Qi An; Philipp Azzarello; Felicia-Carla-Tiziana Barbato; Paolo Bernardini; Xiao-Jun Bi; Hugo Boutin; Irene Cagnoli; Ming-Sheng Cai; Elisabetta Casilli; Jin Chang; Deng-Yi Chen; et al. (Nature, 2026)