ðɪ ᵻvˈɛnts ʌv ˈɪntɹɛst tə kˈætɹɪn, ɪnwˌɪtʃ ðɪ ᵻlˈɛktɹɑːn tˈeɪks ˈɔːlmoʊst ˈɔːl ðɪ ˈɛnɚdʒi ænd ðə nuːtɹˈiːnoʊ ˈɔːlmoʊst nˈʌn, ɑːɹ vˈɛɹi ɹˈɛɹ, əkˈɜːɹɪŋ ɹˈʌfli wˈʌns ɪn ɐ tɹˈɪliən dᵻkˈeɪz.
The events of interest to KATRIN, in which the electron takes almost all the energy and the neutrino almost none, are very rare, occurring roughly once in a trillion decays.