t TOL2.
          If ALG = 'I', TOL2 also measures the relative residual of
          the solutions computed by the CG algorithm (for the whole
          optimization). Termination of a CG process occurs when the
          relative residual is at most TOL2.
          If the user sets  TOL2 &lt; 0,  then  SQRT(EPS)  is used
          instead TOL2. This default value could require many
          iterations, especially if TOL1 is larger. If INIT = 'S'
          or 'B', it is advisable that TOL2 be larger than 