anAttrC->isInitialized() && anAttrD->isInitialized() ) {
double aA = anAttrA->value(), aB = anAttrB->value(),
aC = anAttrC->value(), aD = anAttrD->value();
anAttrC->isInitialized() && anAttrD->isInitialized() ) {
double aA = anAttrA->value(), aB = anAttrB->value(),
aC = anAttrC->value(), aD = anAttrD->value();