  The charge topology of coherent-dissociation events is presented for $^{11}$C
and $^{12}$N nuclei of energy 1.2~\textit{A}~GeV per nucleon bombarding nuclear
track emulsions. This topology is compared with respective data for $^{7}$Be,
$^{8,10}$B, $^{9,10}$C and $^{14}$N nuclei.
