= {
"There are two choices for this option. If a value is specified, a "
"FixedSpeedCubic function of time will be used for the expansion map "
"at the outer boundary and this number will determine its velocity. If "
"'Auto' is specified, the behavior will depend on what is chosen for "
"'InitialValuesOuterBoundary'. If values are specified for "
"'InitialValuesOuterBoundary', then 'Auto' here means a "
"SettleToConstant function of time will be used for the expansion map "
"at the outer boundary. If 'FromVolumeFile' is specified for "
"'InitialValuesOuterBoundary', then a FixedSpeedCubic function of time "
"will be used and the velocity from the function of "
"time in the volume file will be used."}