Before revision: The layer-ordered heap (LOH) is a novel data structure used in optimal selection on a Cartesian sum, algorithms with the best known runtime for selection on X_1+X_2+\cdots+X_m, and the world's fastest isotope calculator .
After revision: The layer-ordered heap (LOH) is a novel data structure used in optimal selection on a Cartesian sum, algorithms with the best known runtime for selection on X_1+X_2+\cdots+X_m, and the fastest method in practice for computing the most abundant isotope peaks in a chemical compound .