FRIDA implementation note: documentation of historic data formats
Note that these formats are largely isomorphous, since the data model has little changed over the years. The last major change was the introduction of multi-z-coordinates (probably along with the i96-Format).
ASCII-01
Used in preliminary versions of Frida-2. File name extension “.a01”. A sample file with 2 spectra:
ASCII-01 JWu
typ D
fil grid5x2
doc x := 2.70*i
doc z0 := 2.35*j
doc y := x^2+12.34*y
doc coordinate x renamed from 2.7*i (*) into Breite (m)
doc coordinate y renamed from 2.7*i^2+12.34*y (*^?) into Hoehe (m)
doc coordinate z0 renamed from 2.35*j (*) into Tiefe (m)
doc saved as grid5x2 on Tue Mar 21 23:16:14 2006
x Breite m
y Hoehe m
z0 Tiefe m
#j 2
scn 0
Z 1
0
XY 5
0 0
2.7 7.29
5.4 29.16
8.1 65.61
10.8 116.64
scn 1
Z 1
2.35
XY 5
0 0
2.7 7.29
5.4 29.16
8.1 65.61
10.8 116.64
eof
Comments:
- Very nice to read
- The many blanks in the XY sections are an enormous waste of storage.
- The usage of “#” in the meaning of “number of” needs to be rethought, since in the scripting world, its the comment prefix (especially so in column 0)
- “scn” stood for “scan”; throughout Frida-2, “scan” shall be renamed back to “spectrum”
- “doc ” should not be repeated in every line; instead, use begin and end tag
ASCII-96
Used in Frida-1. Is used as a standard since 1996. A sample file with 2 spectra:
ASCII-96
(a24,a56)
fil filename
tit long title
doc oosc
dir
sub instrument
&eob 2 (end of block) ------------------------
(a24,i16)
?det-bal-sym 0
@sam-erg-gain -1
plot-sy# 0
&eob 3 (end of block) ------------------------
(a24,a24,g20.10)
E0 meV 2.334191189
T K 1200.000000
cts[mon] 420564.0000
at-mass amu 1.000000000
FP m 2.483000040
Cw usec 7.125000480
&eob 4 (end of block) ------------------------
(a4,a24,a24)
x w meV
y S(2th,w) meV-1
z1 2th
&eob 5 (end of block) ------------------------
(a80)
IN6:
"ht"
normalized to 27
y=y-#, #=6e-6
y=y/#, #=y=S(2th,w)
deleted sptra 95-97
chs kept 1-1021
&eob 6 (end of block) ------------------------
(2i8)
(i16,4g16.8/5g16.8)
(3(2x,g16.8))
2 1
&spectrum 1
5 5.000000
-1.6909029 0.27020141 0.30771835
-1.6895938 0.26911141 0.30647704
-0.15219796 0.10242032 0.58738120E-01
0.10496248E-01 2.2390736 0.28680437
0.17196839 -0.27120464E-01 0.18103506E-01
&spectrum 2
5 10.000000
-1.7605379 -0.65812241E-01 0.16396864E-05
-1.7594403 -0.65739436E-01 0.16396864E-05
-1.7583395 0.20337768 0.26886582
-1.7572356 -0.65237570E-01 0.16271324E-05
-1.7561285 -0.64987736E-01 0.16208946E-05
Comments:
- clear structure, very easy to read
- sectioned by type definitions (will become obsolete for scripting languages)
- huge amount of storage capacity needed (blanks and zeros in measured data)