Dear MPB/MEEP community:

        I've obtained the raw eigenvectors of a simple 2-D photonic crystal 
calculated by MPB. The data structure has a dimension
of   b*4*N  ,   b is the number of bands  ,   N is the number of planewaves 
(grid points),   but I don't know the second number 4 means. 
What does each of the four numbers represent?

        Is anyone know this? Looking forward to your reply.  THANK YOU.



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