ORTEP checks for certain exceptional situations, and when one of these occurs, a fault message, "FAULT NG = NG ADC m" is written in the ORTEP output file. NG is the fault indicator number and ADC and m identify the atom code and the instruction involved (if these are relevant). If necessary and possible, corrective measures are made by ORTEP and the calculation proceeds; otherwise, the job is terminated by calling subroutine EXITNG.

NG	Subroutine Involved	Fault	Action
1	PRELIM	No sentinel found after reading 96 symmetry cards	Tries to read parameter cards
2	PRELIM	No sentinel found after reading the parameter cards for 505 atoms	Tries to read instruction cards
3	PRELIM	Anisotropic temperature factor coefficients form a matrix which is not positive definite	EXIT, after printing out all rms principal values (imaginary ones are listed negative)
4	ATOM, PAXES	Symmetry operation number is higher than the number of input operations	Omit atom
5	ATOM, PAXES	Atom number is higher than the number of input atoms	Omit atom
6	EIGEN	Null temperature factor matrix or failure in bisection routine	EXIT, after printing out all principal values
7	EIGEN	Eigenvector routine failure due to null vector	EXIT, after printing out all principal values
8	INITSC	Error initializing screen driver	EXIT
9	MAIN, SPARE	Unidentified instruction number	Omit faulty instruction
10	BOND, F700	Atom out of bounds	Omit atom
11	F800	No vector search codes	Omit instruction
12	F600, SEARCH	Insufficient number of atoms in ATOMS array	EXIT
13	BOND	Imaginary bond intersection (i.e., bond larger than atom)	Omit bond
14	BOND	Hidden (end-on) bond	Omit bond
15	F900	Null vector as base line	Omit label
16	STORE	ATOMS array is full	Omit all succeeding atoms
17	LAP700, LAPAB	Maximum number of overlapping atoms (20) exceeded	Additional atoms not corrected for overlap
18	LAP800, LAPAB	Maximum number of overlapping bonds (30) exceeded	Additional bonds not corrected for overlap

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Page last revised: May 6, 1996