keyword:
TRUST-REGION-RADIUS (real)
The initial trust region radius is normally set internally by LANCELOT.
However, the user may have good reason for overriding this value. If the
user wishes to specify an initial radius, the value of the radius should
follow the keyword TRUST-REGION-RADIUS. A nonpositive value will
be replaced by a value chosen by LANCELOT. The default is for
LANCELOT to select the initial radius.