The graph data tab allows plotting and simple fitting of data in
individual scans as well as combined data. To graph a
single scan, the top-most blue button must say Graphing data sets
(any column) (as opposed to Graphing Data
Buffers - to change the selection simply click on the button).
Type the appropriate scan number in the Run Number box. The
default x and y values specified in the corresponding data file will
then appear in the X_Data_Column
and Y_Data_Column
list boxes and the user can change these values to correspond to the
desired x and y columns for the plot. If New Plot is
selected, clicking on the Graph Data button will plot the
scan with the specified x and y values.
To perform a fit to the data, enter the appropriate number of peaks in
the Fit to N peaks box.
The initial guesses can then be changed by clicking on the grey
up/down arrows or by typing the numbers into the appropriate numerical
boxes (when the guess values change, a solid curve corresponding to
these initial guesses will be plotted). Any value can be held by
clicking on the green light next to the relevant parameter. Once
reasonable initial guesses are entered, the fit is performed by clicking
on the Perform Fit button (the button
will turn red and indicate Fitting while a
fit is being performed). When the fit is completed, the fit
coefficients and the chi-squared value will be displayed.
To overplot several plots, select Overplot
instead of New
Plot, type the number in the Run Number
box, select the appropriate x and y columns and click on the Graph Data
button.. The data in each plotted scan can be fit by selecting the
appropriate scan from the drop down menu next to the Perform Fit
button (labelled Ni powder (1,0,0) in the image below). The same
procedure as outlined above can be used to perform the fit.
The data contained in data buffers can also be plotted in the Graph Data tab
(for more information on generating and plotting data buffers, see the Combine
Data help page).
A hardcopy of the current plot can be obtained
by clicking the Hardcopy
button. The destination printer can be changed from the main
program by selecting File - Page Setup
from the pull-down menus as shown in the left panel image below.
The page setup box will then appear (as shown in the right panel
image below) and the printer can be changed by selecting the Printer setup ...
button.
The standard printer selection box will then appear and the printer can
be selected from the Name pull-down
menu (see image below). Once the correct printer is selected the
change will be applied by clicking on the OK button.
