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Any PDFgetX2 session at any stage can be saved into a history file, and loading of the history file will restore the saved session. Each internal parameter is given a key identified by a logical keyword in the history file. You could edit the parameter values, but this should rarely happen since all essential parameters are accessible from the GUI.
For your reference, a history file is included below. Some lines are truncated for readability.
# Format:
# Two sections are in this history file:
# 1) Preprocess SPEC Data, 2)Get X-ray PDF
# First delimiter is #######(7) which separates the two,
# second is #####(5) which starts each subsection following.
# Note:
# You may modify this history file using a text editor, however,
# extreme caution must be paid to preserve the format. There should
# no blank before or after "=" sign, except no info available, please
# don not change the number of strings in each line even that line is
# too long or too short!
#
History written: Sun Jan 18 15:53:29 2004
Produced by xiangyun
####### SPECData_Reduction #######
##### ScansData_Setup ViewSelect_Isa=0
SpecFile=ingaas_tutorial.spec Num_Scans=5
#L NO. Scannum Valid Select Highlight Has_MCA
0 1 1 1 1 0
1 2 1 1 1 0
2 3 1 1 1 0
3 4 1 1 1 0
4 5 1 1 1 0
##### SPECMCA_Setup
QColumn=pmQ MonitorColumn=IC2 Num_Detectors=1
#L Det_# Used SPEC_Col MCACol USE_SPEC Use_MCA
0 1 ELASTIC 0 1 0
##### SPECCorrection_Setup
### Monitor_SetUp TargetColumn=IC2 DTC_Isa=1
Theory_Isa=0 TotoalCountsColumn=<click_me>
MeasuringTimeColumn=<click_me> DeadTime=3.000000
Pulser_Isa=0 PulserColumn=<click_me>
None_Isa=1
### Detector_SetUp TargetColumn=ELASTIC DTC_Isa=1 IDetector=0
Theory_Isa=0 TotoalCountsColumn=TOTAL
MeasuringTimeColumn=Seconds DeadTime=11.600000
Pulser_Isa=1 PulserColumn=PULSER
None_Isa=0
## Merge_Setup Normalize_Isa=1 NormColumn=IC2 NormColumnType=1
AutoScale_Isa=0 Qmin=0.100000 Qmax=100.000000
#L Scannum Add Multiply Qmin Qmax Imin Imax
-1 0.000000 1.000000 1.000000 12.900000 0.000000 0.000000
-1 0.000000 1.000000 1.000000 12.900000 0.000000 0.000000
-1 0.000000 1.000000 12.00000 40.000000 0.000000 0.000000
-1 0.000000 1.000000 12.00000 40.000000 0.000000 0.000000
-1 0.000000 1.000000 12.00000 40.000000 0.000000 0.000000
### ScanData_DeGlitching Num_Glitches=42
#L scannum column imin imax
-1 -1 -1 -1
### MergedData_DeGlitching Num_Glitches=1
#L scannum column imin imax
-1 -1 -1 -1
##### Plot_Setup
PlotStyle=1 DataType=2 CompareDetectors_Isa=0
XColumn=<click_me> YColumn=ELASTIC NColumn_Isa=0 NColumn=IC2
####### Get_XPDF #######
##### General_Setting
title=X-ray PDF
workingdirectory=/u24/xiangyun/projects/PDFGetX/tutorial/
quiet=0 debug=0 autosave_isa=1 savefilenamebase=ingaas_tutorial
iqfilesurfix=.iq sqfilesurfix=.sq fqfilesurfix=.fq grfilesurfix=.gr
##### DataFileFormat
datatype=0 (0:SPEC, 1:CHI, 2:nxm column, 3:unknown)
num_skiplines=0 comment_id=# delimiter=
### SPEC Format scan_id=#S scan_delimiter=
columnname_id=#L columnname_delimiter=
data_id= data_delimiter=
### CHI Format
### nxm column Format
### End of file format
##### Data&Background
samfile=ingaas_tutorial.int num_sams=1
sambkgfile=ingaas_tutorial.bkg num_sambkgs=1
confile= num_cons=1
conbkgfile= num_conbkgs=1
det# used xcol detcol deterrcol xmin xmax add_det mul_det add_bkg mul_bkg add_con mul_con add_conbkg mul_conbkg
0 1 0 1 3 1.00000 40.0000 0.00000 1.00000 0.00000 1.00000 0.00000 1.00000 0.00000 1.00000
##### Experiment_Setup
title=InGaAs local structure
user=Dr. Jeong
facility=CHESS
temperature=300.000 containermut=0.000500000 filtermut=0.0200000
## X-Ray radiationtype=3
(0: Ag K_alpha, 1:Cu K_alpha, 2:Mo K_alpha, 3:Customize)
lambda=0.207800 energy=59.6655 polartype=2 polardegree=0.950000
## MonoChromator crystaltype=0 (0:Perfect, 1:Mosaic, 2:None)
position=0 (0:Primary beam, 1:Diffracted beam)
dspacetype=2 (0:Si{111}, 1:Ge{111}, 2:Customize) dspacing=3.13500
##### Sample_Setup information num_atoms=3
#L symbol valence fractions z weight macoef asf_a[5] asf_b[5] asf_c compcoef_a[5] compcoef_b[5] compcoef_c
Ga 0.000000 2.000000 31.000000 69.723000 39.956245 15.758946 6.841123 4.121016 2.714681 2.395246 3.121754 0.226057 12.482196 66.203621 0.007238 -0.847395 3.036000 5.176000 11.669200 8.294000 2.814800 104.577003 11.280300 2.066300 0.331400 0.038000 0.000000
As 0.000000 3.000000 33.000000 74.921590 46.441498 17.025642 4.503441 3.715904 3.937200 6.790175 2.597739 0.003012 14.272119 50.437996 0.193015 -2.984117 3.338500 5.622900 12.244900 8.866800 2.913800 82.487900 12.072300 1.831700 0.299600 0.034100 0.000000
In 0.000000 1.000000 49.000000 114.820000 20.441433 6.196477 18.816183 4.050479 1.638929 17.962912 0.042072 6.695665 31.009790 103.284348 0.610714 0.333097 4.703100 8.236100 16.420601 14.660800 4.949300 89.209602 8.996500 1.722900 0.206200 0.023800 0.000000
geometry=1 absorpCoef=1.1100000 numberdensity=0.00000
thickness=0.00000 packingFraction=0.00000 mut_theory=0.00000
##### GetIQ_Setup
xformat=2
filtercorr_isa=0 samfiltercorr_isa=0 sambkgfiltercorr_isa=0
confiltercorr_isa=0 conbkgfiltercorr_isa=0
scatveffcorr_isa=0 samconveffcorr_isa=1 sambkgveffcorr_isa=0
conbkgveffcorr_isa=0
nonegative_isa=1 negativevalue=-1.00000
##### Calibration_Data
## Detection efficiency energy dependence detedepxaxis=0
detedepfunctype=0 detedep_elastic=1.00000 detedep_fluores=1.80000
detedep_quadra=0.00000 detedep_spline=0.00000 detedep_file=
## Detector transmission energy dependence dettcoefxaxis=0
dettcoeffunctype=0 dettcoef_elastic=0.950000 dettcoef_fluores=0.60
dettcoef_quadra=0.00000 dettcoef_spline=0.00000 dettcoef_file=
##### IQ_Simulation
### Elastic used_isa=1 mymethod=1
do_samabsorp=1 do_multscat=1 do_conabsorp=0 do_airabsorp=0
do_polarization=1 do_oblincident=0 do_energydep=0
do_breitdirac=0 breitdiracexpo=2.00000
do_rulandwin=0 rulandwinwidth=0.00100000
do_useredit=0 add_user=0.00000 mul_user=1.00000
### Compton used_isa=1 mymethod=0
do_samabsorp=1 do_multscat=1 do_conabsorp=0 do_airabsorp=0
do_polarization=1 do_oblincident=0 do_energydep=0
do_breitdirac=1 breitdiracexpo=2.00000
do_rulandwin=1 rulandwinwidth=0.00300000
do_useredit=0 add_user=0.00000 mul_user=1.00000
### Fluores used_isa=0 mymethod=1
do_samabsorp=1 do_multscat=1 do_conabsorp=0 do_airabsorp=0
do_polarization=1 do_oblincident=0 do_energydep=0
do_breitdirac=0 breitdiracexpo=2.00000
do_rulandwin=0 rulandwinwidth=0.00100000
do_useredit=0 add_user=0.00000 mul_user=1.00000
##### Correction_Setup corrmethod=1
oblincident_isa=0 dettranscoef=0.999000 samfluore_isa=0
samfluoretype=0 samfluorescale=0.23000000
multiscat_isa=1 xraypolar_isa=1 samabsorp_isa=1
highqscale_isa=1 highqratio=0.490000 scaleconst=0.00159925
scaleconst_theory=0.00159925
comptonscat_isa=1 rulandwin_isa=1 rulandintewidth=0.00300000
comptonmethod=1 breitdirac_isa=1 breitdiracexponent=2
detefficiency_isa=0 detefficiencytype=0 (0-1: linear, 2-3: quadratic)
detefficiency_a=1.0500000 detefficiency_b=9.9999997e-05
lauediffuse_isa=1
weight_isa=1 weighttype=0 (0: <ASF>^2, 1: <ASF^2>, 2: Data Smoothed)
weightsmoothrmin=3.00000 weightsmoothwidth=100 weightsmoothcycles=600
editsq_isa=0 editsqtype=0 add_sq=0.00000 mul_sq=1.00000
editsqsmoothrmin=3.00000 editsqsmoothwidth=100 editsqsmoothcycles=600
smoothdata_isa=0 smoothfunctype=0 smoothqmin=12.0000 smoothboxwidth=9
interpolateqmin_isa=0 qmininterpolationtype=0
dampfq_isa=0 dampfqwidth=23.0000
##### SqGr_Optimization Setup
ftmethod=0 varcovarfile=grvar_covar.dat
## S(q) qmin=1.000000 qmax=40.000000 qgrid=0.000000
## G(r) rmin=0.000000 rmax=20.000000 rgrid=0.010000
## SqOptimization sqoptfunction=1
optqmin=20.0000 optqmax=40.0000 optqgrid=0.00000
optrmin=0.00000 optrmax=2.20000 optrgrid=0.01000000
maxiter=20 relstep=0.00000 weighttype=2 weightfunc=0
fitbkgmult_isa=0 fitsampmut_isa=1 fitpolariz_isa=1
fitoblique_isa=0 fitfluores_isa=0
fitrulandw_isa=1 fitenergya_isa=0 fitenergyb_isa=0
fitsimurulandw_isa=1 fitDetEdepfluores_isa=0 fitDetEdepquadra_isa=0
fitDetEdepspline_isa=0 fitDetTCoefElastic_isa=0 fitDetTCoefFluores_isa=0
fitDetTcoefquadra_isa=0 fitDetTcoefspline_isa=0
##### Save&Plot Settings
datatype=SqtoFq iqcorrtype=BkgSub iqsimutype=SimuIq
sqcorrtype=DetEff sqtofqtype=FqData
gropttype=OptFq miscdatatype=AtomASF