if ( calculate_normalized_shannon_entropy ) {
_entropy7 = MsaMethods.calcNormalizedShannonsEntropy( 7, msa );
_entropy21 = MsaMethods.calcNormalizedShannonsEntropy( 21, msa );
if ( calculate_normalized_shannon_entropy ) {
_entropy7 = MsaMethods.calcNormalizedShannonsEntropy( 7, msa );
_entropy21 = MsaMethods.calcNormalizedShannonsEntropy( 21, msa );