Canonical Vol Table

Key _Canonical Vol Table in Vol Curve refers to the volatility table used internally by Deriscope that has a fixed axis ordering and includes the interpolated values.

Note this key is prefixed by _, which indicates it is regarded as a read-only part of the object's data and therefore its associated value cannot be edited.
For that reason it does not appear as part of the input data.
It carries informational only value for the user and appears as part of its contents.
Also it completely depends on the remaining object contents and therefore is never part of the exported object's data.