The pandeia engine is a ‘simulation-hybrid’ engine that performs calculations on two-dimensional astronomical scenes created by the user. It uses a pixel-based 3D approach, modeling both the spatial and wave-length dimensions using realistic PSFs for each instrument mode, and handles saturation, correlated read noise, and inter-pixel capacitance.
To use the engine, you will need to obtain the associated data package. Download [pandeia_data-1.2.tar.gz](http://ssb.stsci.edu/pandeia/engine/1.2/pandeia_data-1.2.tar.gz) and unpack it with this command:
tar xf pandeia.engine-1.2.tar.gz
Then define the “pandeia_refdata” variable as the path to the data:
export pandeia_refdata=/path/to/pandeia_data
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