Structure of the input data:
===============================================================================
&inputgw
...
/

Frequencies
...
/

K_points
...
/

========================================================================
NAMELIST: &inputgw
   +--------------------------------------------------------------------
	Variable:	  do_coulomb, do_green, do_sigma_exx, do_sigma_c,
			      do_sigma_matel.

   Type:           LOGICAL
   Default:        .false.
   Description:	   control variables for determining which aspects of
				   the calculation are to be run. In order perform calculation
				   of screened coulomb interaction, green's function, exact
				   exchange component of the interaction, the correlation
			       energy, and the matrix elements of the single particle
				   states with the various operators.
   +--------------------------------------------------------------------

   +--------------------------------------------------------------------
   Variable:       prefix
   Type:           CHARACTER
   Default:        'sgw'
   Description:    prepended to input/output filenames:
                   prefix.wfc, prefix.rho, etc. Must be the same
				   as the underlying scf calculation.
   +--------------------------------------------------------------------


   +--------------------------------------------------------------------
   Variable:       use_symm
   Type:           LOGICAL
   Default:        .TRUE.
   Description:   Logical variable to determine whether or not symmetry
				  is used to reduced the number of independent solutions
				  of the Sternheimer equation required. use_symm only
			      calculates electronic response to unique G vectors.
   +--------------------------------------------------------------------

K_Points
========================================================================
Line of input:
      nqs
      xq(1)  xq(2)  xq(3)
   DESCRIPTION OF ITEMS:
      +--------------------------------------------------------------------
      Variable :      nqs
      Type:           INTEGER
      Description:    number of q points 

      Variables:      xq(1)  xq(2)  xq(3)

      Type:           REAL
      Description:    The electric field wavevectors, or the point at which
                      Sigma_{q} is calculated in units of 2pi/a0
                      (a0 = lattice parameter).
      +--------------------------------------------------------------------
===End of line-of-input=================================================