| | | Variables that MUST BE SPECIFIED 
| fildrho | CHARACTER |  
| Default: | ' ' |  | 
The file containing the variation of the charge
density at the q point under consideration, this
file is produced by phonon.
            
 |  
| fild0rho | CHARACTER |  
| Default: | ' ' |  | 
The file containing the variation of the charge
density at q=0, this file is produced by phonon.
            
 |  
| amass(i), i=1,ntyp | CHARACTER |  | 
ionic masses [atomic mass units]
            
 |  | 
 
| prefix | CHARACTER |  
| Default: | 'pwscf' |  |  prefix for file names
         
 |  
| outdir | CHARACTER |  
| Default: | value of the ESPRESSO_TMPDIR environment variable if set;
current directory ('./') otherwise |  | 
Directory containing input, output, and scratch files;
must be the same as specified in the calculation of
the unperturbed system and for phonon calculation.
         
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| fildyn | CHARACTER |  
| Default: | 'd3dyn' |  | 
The file where the derivative of the dynamical
matrix will be written
         
 |  
| ethr_ph | REAL |  
| Default: | 1.0d-5 |  | 
Threshold for iterative diagonalization
(accuracy in ryd of the calculated eigenvalues).
         
 |  
| q0mode_todo(i), i=1,3*nat | INTEGER |  
| Default: | 0 |  
| Status: | q0mode_todo is statically allocated to dimension 300 |  | 
This array contains the list of the q=0 modes that
will be computed. If q0mode_todo(1).eq.0 the
program will compute every q=0 mode.
         
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| wraux | LOGICAL |  
| Default: | .false. |  | 
If .true. the program will write different terms
of the matrix on different files.
         
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| recv | LOGICAL |  
| Default: | .false. |  |  Specify .true. for a recover run.
         
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| istop | INTEGER |  
| Default: | 0 |  | 
If this number is set different from zero the
program will stop after the specified routine
and will write the partial result in the recover
file.
         
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| iverbosity | INTEGER |  
| Default: | 0 |  |  type of printing ( 0 few, 1 all )
         
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