[do_pt2_end]
type: logical
doc: If true, compute the PT2 at the end of the selection
interface: ezfio,provider,ocaml
default: True

[PT2_max]
type: PT2_energy
doc: The selection process stops when the largest PT2 (for all the state) is lower
     than pt2_max in absolute value
interface: ezfio,provider,ocaml
default: 0.0001

[var_pt2_ratio]
type: Normalized_float
doc: The selection process stops when the energy ratio variational/(variational+PT2)
     is equal to var_pt2_ratio. (Obsolete. Need to be removed)
interface: ezfio,provider,ocaml
default: 0.75

[correlation_energy_ratio_max]
type: Normalized_float
doc: The selection process stops at a fixed correlation ratio (usefull for getting same accuracy between molecules)
     Defined as (E_CI-E_HF)/ (E_CI+PT2 - E_HF)
     If Ratio==1 it will not be used. (E_HF) is not required. 
interface: ezfio,provider,ocaml
default: 1.00

[threshold_generators_pt2]
type: Threshold
doc: Thresholds on generators (fraction of the norm) for final PT2 calculation
interface: ezfio,provider,ocaml
default: 0.999

[threshold_selectors_pt2]
type: Threshold
doc: Thresholds on selectors (fraction of the norm) for final PT2 calculation
interface: ezfio,provider,ocaml
default:        1.