hi,
u can use gnubans in Utiil-siesta for plotting bandstructure .
u first compile gunbands.f then use  below command:
gnubands <agnr.bands> agnr.bands.dat
 

________________________________
 From: Dr. Amar Bahadur <[email protected]>
To: [email protected] 
Sent: Wednesday, March 6, 2013 9:59 AM
Subject: [SIESTA-L] Regarding band gap calculation
  

Dear Siesta Users,
                            I run the agnr .fdf file in Siesta. Now, how is the 
energy gap between valence band and conduction band (band gap) is calculated? 
The .fdf, .bands, .DOS and .EIG files are attached. Help me.

-- 
Kind Regards.

==================
Dr. Amar Bahadur
(Department of Physics)
Kamla Nehru Institute of Physical and Social Sciences,
Sultanpur- 228 118 (U.P.) India
Email: [email protected] 
Mob.-+91-9451431428, 9044160486 

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