Once a data file has been created
or loaded (File, Open or or simply drag and drop a .pgo file onto the main
window) simply press the red simulate button if a simulation does not appear
automatically. To change the molecular parameters use the Constants Window.
The plot menu entries, many of which are also available as toolbar
buttons, can be used to adjust the appearance of the plot. The
Offset, rotational temperature (T), and the Gaussian (Gau) and
Lorentzian (Lor) contributions to the linewidth can also be changed
using the boxes in the
Note: To zoom in on a
particular region of the plot, the Plot Selection ()
button is normally the most useful, with the All button used to zoom out.
The items below are available as
buttons on the toolbar or
from the plot menu:
|Left||Shift plot range to left|
|Right||Shift plot range to right|
|Compress||Compress horizontal plot range|
|Expand||Expand horizontal plot range|
|Plot Selection||Click and drag the mouse over part of the spectrum and then press this button to change the horizontal plot range to the selected range. See below to adjust the vertical scale.|
|All||Expand horizontal plot range to include all simulated lines and overlayed spectra. This button is particularly useful if you have "lost" your spectrum.|
|Next Plotstyle||Cycle through available styles of plot|
|Show Parts||Toggle display of individual spectra making up the overall spectrum|
|Show Sum||Toggle display of sum of individual spectra|
|Fortrat, Show||Toggle display of a Fortrat Diagram|
||Select upper or lower state quantum number as
vertical axis in Fortrat diagram. It is also possible to adjust the
quantum number used; the default is J,
in the Simulation object.
|Units||Select units for horizontal axis - Possibilities are cm-1, MHz, Kelvin, eV, velocity (in units of cm-1/2), nm in vacuum and nm in air.|
|Magnify from Bottom||Reduce vertical range of plot by
a factor of two, and turn off automatic upper limit. The lower limit of
the plot is left unchanged. This only affects the overlay scaling,
unless no overlays are displayed, in which case the scaling of the
simulation is changed. For more control, see AutoMin, AutoMax, Ymin and Ymax in the Simulation and Plot
|Magnify from Top||Reduce vertical range of plot by a factor of two, and turn off automatic lower limit. The upper limit of the plot is left unchanged. This only affects the overlay scaling, unless no overlays are displayed, in which case the scaling of the simulation is changed. For more control, see AutoMin, AutoMax, Ymin and Ymax in the Simulation and Plot objects.|
||Toggle automatic vertical scaling. This only affects the overlay scaling, unless no overlays are displayed, in which case the scaling of the simulation is changed. For more control, see AutoMin, AutoMax, Ymin and Ymax in the Simulation and Plot objects.|
|This enables the colour, the width of the lines and the line style of spectra to be changed. To alter one of these settings, select the relevant tick box, click "Apply", alter as required, and click "OK". The changes will be effected on re-simulating the spectrum. Selecting "Default" restores spectra to solid, zero width lines. (Colours of spectral lines are best changed in the constants window.)|
|Select font for plots.|
Variable Char Size
|Select (default) for character
size on printout, clipboard and export to reflect on screen
proportions. If not selected the character size remains fixed.
Limit Line Segments
|Select (default) to limit number
of segments on a plotted curve. It can be helpful to unselect this
option if you intend to edit exported plots. The only drawback is that
the resulting plots can be too complicated for some programs to handle.
|Magnify Plot|| Click and drag with the mouse to select a region to zoom
into with this button. In contrast to Plot
Selection and other
buttons above, this changes
both the vertical and horizontal scale, and the scaling is reset when
the plot is updated.
|Shrink plot||Shrink plot in both vertical and horizontal scale.
|Reset Zoom||Reset plot zoom to fill window. This happens implicitly when
the plot is updated.