[molpro-user] how to get Cartesian Force Constants?

[Haitao Ma]

Dear Molpro user,
                                                                                                      
    With numerical and numhes card, I can get the 3N gradients and 3N
second derivatives of a specific molecular with N atoms. But I want to get 
the 3N*(3N+1)/2 Cartesian Force Constants, what supposed to write in the 
input file? 
    Thank you!
    Yours sincerely
    MHT