__The first line__:

The title, which does not affect
the phasing process.

__STATUS__(by
default = 0)

0: for unknown
structures

1: for known
structures, comparison will be made between the given and DIMS-derived
phases of the satellites

__PATH__(=3)

1: for phasing
the satellites of incommensurate structures with known phases of the mains,
and the WEAK-WEAK relationships are used such that the obtained phases
of the nth-order satellites are taken as known phases for phasing the (n+1)th-order
satellites. Only one of the 1st-order satllites is assigned a 'known'
phase ZP1 to determine the origin of the 4th axis.

2: for phasing
the satellites of incommensurate structures with known phases of the mains,
and the WEAK-WEAK relationships are neglected for phasing all the satellites.
One of each nth-order satllites is assigned a 'known' phase in phasing
procedure. In this case, you can assign these 'known' phases ZPn.

3: for phasing
the satellites of incommensurate structures with known phases of the mains,
the satellites with order greater than 1 are phased using PATH=2 and then
WEAK-WEAK relationships are used to determine the ORIGIN-DEPENDING PHASE
SHIFT.

4: phasing
for composite structures, the WEAK-WEAK relationships are neglected.

__ZP__n

phase value
of an nth-order satellite, which is used as the origin-fixing reflection
for phasing the nth-order satellites.

__ORDER__(=2)

0: phasing
for mains with phases of certain number of mains being known.

>0: for PATH
equal 1 ,2 or 3, up to ORDERth-order satellites will be phased with known
phases of all the mains.

128: for PATH
equal 4, only mains will be phased.

129: for PATH
equal 4, all satellites will be phased with known phases of all the mains,
and the WEAK-WEAK relationships are neglected.

130: for PATH
equal 4, all mains and satellites can be phased together with WEAK-WEAK
relationships neglected (not recommended).

__RANTP__
(=0) active only for acentric space group with PATH=4

0: random
phases of 45/135/225/315 are assigned

1: random
phases of 0/180 are assigned

__RADIUS__
(=0)

0: input
phases in degree.

1: input
phases in radius.

__MAXREL__

maximum number
of sigma2 relations acceptable for a single reflection.

__KPMAX__
(=50.0)

sigma2-relationships
with kapa greater than KPMAX are to be eleminated.

__KPMIN__
(=0.0)

a parameter
(ranging from 0.0 to 2.0) for eleminating sigma2-relationships with kapa
less then KPMIN.

__PPERC__
(=1.0)

the strongest
PPERC ´ 100 % reflections will be phased,
active only when phasing main reflections of composite structures (PATH=4,
ORDER=128).

__NTRIAL__
(=50)

number of
trials, i.e. the number of random-starting phase sets (max. NTRIAL = 1024).

__SKIP__
(=0)

skip the first
SKIP trials.

__NFSn__
(n = 0, 1, ..., 6)

> or = 0:
output the phase set containing up to the nth-order satllites selected
by CFOM.

< 0: abs(NFSn)
will be the serial number of the set that you want to output disregarding
the value of CFOM.

__CLCTR__
(=0.005)

a parameter
to control dynamically the number of cycles of phase refinement.

__MAXCL__
(=10)

max number
of cycles for tangent-formula iteration.

__NCLFIX__
(=6)

in the first
NCLFIX cycles for tangent-formula iteration the KNOWN phases are kept FIXED,
after that they are changeable during the refinement.

__A1, B1,
C1, ALFA1, BETA1, GAMA1__

unit-cell
parameters of the BASIC STRUCTURE for modulated structures, or of the FIRST
SUB-STRUCTURE for composite structures.

__A2, B2,
C2, ALFA2, BETA2, GAMA2__

unit-cell
parameters of the SECOND SUB-STRUCTURE for composite structures.

__K1__,
__K2__,
__K3__

the a*, b*
and c* components of the modulation wave vector ** q**, i.e.

__W1__
(=0.2), __W2__ (=1.4), __W3__
(=1.4)

weights of
the figures of merit ABSFOM, PSI-ZERO and RISIDUAL in the calculation of
the combined figure of merit CFOM

__NOIN__

in the cell
contents, the top NOIN elements belong to the first sub-structure of the
composite structures, active only when phasing main reflections of composite
structures i.e. when PATH=4 and ORDER=128.

__NORMAL__

0/1 corresponds
one of the two strategies for scaling Fobs, active only when PATH=4
and ORDER=128.

__STATIS__

0: no WILSON
statistics will be performed

1: WILSON
method is used to scale Fobs

2: K-curve
method is used to scale Fobs, active only when PATH=4
and ORDER=128.

__BFACTOR__

0.0: the B-factor
from WILSON statistics is used for scaling, else: BFACTOR is used instead
of the B-factor from WILSON statistics; active only when PATH=4,
ORDER=128
and STATIS=1.

__NWLSTEP__
(=16)

number of zones
to be divided in reciprocal space for WILSON statistics

__ELEMENT__

chemical symbol
of atoms in the cell

__ATOMIC
NR__

atomic number
of the specified chemical element

__NUMBER__

number of
atoms in the cell

__SUPERSPACE
GROUP: TWO-LINE SYMBOL or NGENE__

Here you can
just give the two-line symbol, such as

P[C 2/M]-1 S :B

for the sample data of *g *-Na_{2}CO_{3}.
For more details, please refer to Fu Zheng-qing & Fan Hai-fu (1997)
"A computer program to derive (3+1)-dimensional symmetry operations from
two-line symbols" *J. Appl. Cryst. ***30**, 73-78. Or, if you prefer
to provide generators of the superspace group, then: the number of generators
is given first, which can not be neglected and must equal the number of
the matrices listed below.

__KN__

indicating
that the phase (listed in the same line of the preceding column) is known
or not

0: unknown,
its value is to be derived, the listed value will NOT take part in the
derivation, however in the case of STATUS=1 listed
phases will be used to compare with DIMS-derived ones.

1: known,
it will be used as starting phase to derive unknown phases.

2: assign
a random phase value

__MK__

indicating
that the reflection is neglected or not in the phasing procedure

-1: neglected, and
a random phase is given to this reflection in the output.

1: not neglected.

__DN__

for STATUS=1,
indicating the difference between the given and the derived phases.