Sets the unit type for the y-axis of a plot.
sherpa> PLOTY [#] {COUNTS | RATE || ONE | ENERGY | WAVE | ENERGY2 |
WAVE2 }
where # may specify the number of the dataset; the default dataset is 1.
The command PLOTY actually controls two aspects of
plot appearance: whether rates or raw data are shown; and whether the
amplitudes in each bin are to be multiplied by the energy/wavelength
of the bin.
If the user specifies COUNTS, the raw input data will be
displayed (even if these data are not actually counts, but something
else, such as fluxes). What is displayed if the argument
RATE is given depends on whether:
-
the exposure time is provided;
-
an ancillary response file (ARF) is provided;
-
the energy or wavelength grid is provided; and/or
-
the instrument model is defined (see the
INSTRUMENT command).
The user can further customize plots using one of the
following PLOTY settings:
| ONE |
No multiplication by energy or wavelength. |
| ENERGY |
Multiply the amplitudes in each bin by the bin energies. |
| WAVE |
Multiply the amplitudes in each bin by the bin wavelengths. |
| ENERGY2 |
Multiply the amplitudes in each bin by the bin energies squared. |
| WAVE2 |
Multiply the amplitudes in each bin by the bin wavelengths squared. |
The plot labeling function assumes exposure times in seconds, ARFs
with effective area information in cm^2, and
energies/wavelengths in keV/Angstroms.
If necessary, the user can change the label with the
ChIPS command YLABEL.
Note that in CIAO 3.0, the user cannot have separate
PLOTY settings for source and background datasets
with the same dataset #, i.e., changing
PLOTY changes the plot appearance for
both the source and the background
datasets.
Also note that PLOTY controls not just the
appearance of 1D plots, but also the output generated by the
WRITE command. This may be changed in a
future version of Sherpa.
Reset the y-axis units to counts, after they have automatically been
set to rate with the definition of an instrument model:
sherpa> READ DATA data/example.pha
sherpa> RSP[instrumentA](example.rmf, example.arf)
The inferred file type is ARF. If this is not what you want, please
specify the type explicitly in the data command.
sherpa> INSTRUMENT = instrumentA
sherpa> LPLOT DATA
<Rate data are displayed.>
sherpa> PLOTY COUNTS
sherpa> LPLOT DATA
<Counts data are displayed.>
|
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