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import numpy as np
import astropy.io.fits as pyfits

def write_simput_file(ra, dec, energy, emin, emax, flux, prefix, sky_center=None,       
                      clobber=False):
    r"""
    
    Write events to a SIMPUT file that may be read by the SIMX instrument
    simulator. See the SIMPUT definition for reference: 
    http://hea-www.harvard.edu/heasarc/formats/simput-1.1.0.pdf

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There are several different styles of projections that can be made either when creating a projection with ds.proj() or when making a ProjectionPlot.

"integrate": This is the default projection style. It simply integrates the requested field f(\textbf{x}) along a line of sight \textbf{\hat{n}}, given by the axis parameter:

g(\textbf{X}) = {\Big\int\ {f(\textbf{r})\textbf{\hat{n}}\cdot{\mathrm{d\textbf{x}}}}}

The units of the projected field g(\textbf{X}) will be the units of the unprojected field f(\textbf{x}) multiplied by the appropriate length unit, e.g., density in \mathrm{g\ cm^{-3}} will be projected to \mathrm{g\ cm^{-2}}. When using this style, a "weight_field" argument may also be specified, which will produce a weighted projection by

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