The data files can contain a header
but this is not compulsory.
If a header is present, it can
contain the following data.
The format : # KeyWord =
MyValue is
compulsory.
At the moment 5 keywords are
available :
Comment possible value any
string
Particles possible value
« neutrons »
or « xrays »
Polarisation
possible value « non polarised » or « polarised »
or « with spin-flip »
or « with SF high field »
AbscissesUnits
possible
value « deg » or « nm-1 »
TimeOfFlight
possible value « True » or « False »
Example
# Comment = My
data are of very good quality
# Particles = neutrons
# Polarisation = non polarised
# AbscissesUnits
= nm-1
# TimeOfFlight =
False
2 0.3
3 0.7
4 0.1
The experimental
data must be given as follow :
· For non polarised particles, you can
give 2 or 3 columns.
The first must be the incidence angle (°) or the Qz value (nm-1);
The second must be the measured reflectivity;
You can add a 3rd column which will be considered as the error bars
on your data and can be used in weighted fits.
Example
MyAngle
(°) TAB/SPACE
MyIntensity
[TAB/SPACE
Sigma]
· For polarised particles, you can give
either 3 columns or 5 columns.
In the case of 3 columns, they will be considered as “theta”, “up-up”, “do-do”.
In the case of 5 columns, they will be considered as “theta”, “up-up”, “error
up-up“, “do-do” and “error do-do”.
Example
MyAngle
TAB/SPACE MyIntensity
[TAB/SPACE
Sigma]
The separator can
be either a SPACE or a COMMA
Do not leave blank lines in the file, this upsets the program (since it
reads as 0 0 0)