Chandra.ECF is provides a simple method to access the Chandra HRMA Enclosed
Counts Fraction (ECF) data.
http://cxc.harvard.edu/cal/Hrma/psf/
Functions
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Chandra.ECF.interp_ECF(ecf=0.9, theta=0, phi=0, energy=1.5, shape='circular', value='radius')
Compute a 4-d bilinear interpolation of the enclosed counts fraction
radius provided by the CXC calibration group.
| Parameters: |
- ecf – Enclosed counts fraction (0 to 1)
- theta – Off-axis angle (arcmin)
- phi – Off-axis azimuth (deg)
- energy – Energy (keV)
- shape – ‘circular’ or ‘elliptical’
- value – Column in the ECF file to interpolate (default=radius)
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| Return type: | Interpolated ECF radius (arcsec)
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Chandra.ECF.ECF_radius(radius=1.0, theta=0, phi=0, energy=1.5)
Determine the enclosed counts fraction for a given enclosed radius.
| Parameters: |
- radius – enclosed radius (arcsec)
- theta – Off-axis angle (arcmin)
- phi – Off-axis azimuth (deg)
- energy – Energy (keV)
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| Return type: | Interpolated ECF (0 to 1)
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