GammaLib

Christoph Deil reported that he is unable to use numbers in FITS extension names:

In [15]: psf = gammalib.GCTAPsf2D('hess_psf_023523.fits.gz[PSF_2D]')
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-15-e694cf9602ee> in <module>()
----> 1 psf = gammalib.GCTAPsf2D('hess_psf_023523.fits.gz[PSF_2D]')

/usr/local/gamma/lib/python3.4/site-packages/gammalib/cta.py in __init__(self, *args)
   2853         __init__(GCTAPsf2D self, GCTAPsf2D psf) -> GCTAPsf2D
   2854         """ 
-> 2855         this = _cta.new_GCTAPsf2D(*args)
   2856         try:
   2857             self.this.append(this)

RuntimeError: *** ERROR in GFits::at(std::string&): HDU "POINT SPREAD FUNCTION" not found in FITS file

In [14]: gammalib.GCTAResponseIrf().load_psf('hess_psf_023523.fits.gz[PSF_2D]')
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-14-77132b2a0315> in <module>()
----> 1 gammalib.GCTAResponseIrf().load_psf('hess_psf_023523.fits.gz[PSF_2D]')

/usr/local/gamma/lib/python3.4/site-packages/gammalib/cta.py in load_psf(self, filename)
   1582     def load_psf(self, filename):
   1583         """load_psf(GCTAResponseIrf self, std::string const & filename)""" 
-> 1584         return _cta.GCTAResponseIrf_load_psf(self, filename)
   1585 
   1586 

RuntimeError: *** ERROR in GCTAResponseIrf::load_psf(std::string&): File error. FITS file "hess_psf_023523.fits.gz[PSF_2D]" does not contain a valid point spread function table. Please specify a valid point spread function response file.