tails

The most important parameter is the Tails parameter. With this linear scaling is achieved for most parts of the program. By default it is 1e-6, which is a conservative value. According to our experience, total energies are still accurate using a setting like

Tails Bas=1e-3 Rosa

The extra key is named after a former student Rosa Bulo who found out that the largest error caused by the tails approximation comes from contracted functions. She suggested a pragmatical fix that makes makes the criterion more strict for contracted core-like functions.