def correct_lightcurve(lc_file, uf_file, outname=None, expo_limit=1e-7):
"""Apply exposure correction to light curve.
Parameters
----------
lc_file : str
The light curve file, in HENDRICS format
uf_file : str
The unfiltered event file, in FITS format
Returns
-------
outdata : str
Output data structure
Other Parameters
----------------
outname : str
Output file name
"""
outname = _assign_value_if_none(
outname,
hen_root(lc_file) + "_lccorr" + HEN_FILE_EXTENSION)
ftype, contents = get_file_type(lc_file)
time = contents.time
lc = contents.counts
dt = contents.dt
gti = contents.gti
expo = get_exposure_from_uf(time, uf_file, dt=dt, gti=gti)
newlc = np.array(lc / expo * dt, dtype=np.float64)
newlc[expo < expo_limit] = 0
newlc_err = np.array(contents.counts_err / expo * dt, dtype=np.float64)
newlc_err[expo < expo_limit] = 0
lcurve = Lightcurve(time,
newlc,
err=newlc_err,
gti=gti,
err_dist='gauss',
mjdref=contents.mjdref)
lcurve.expo = expo
save_lcurve(lcurve, outname)
return outname
