Sparse Impl Vols

Key Sparse Impl Vols? in Vol Curve refers to an optional Boolean that determines whether the table with the swaption implied vols associated with the key _Sparse Impl Vols is generated as soon as the contents of a Vol Curve object are displayed.
Note this Boolean affects only the display of the object's contents, since for efficiency reasons the mentioned table will never be generated during the creation (but not display) of a Vol Curve object.
TRUE leads to the table generation.
FALSE obstructs the table generation.
If omitted, default is FALSE for enhanced efficiency during the display of the object's contents.