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subroutine pvswitch1(q1,F0,F1,F1a)
C----from F0,F1 calculate F1a which has all denominators
C----shifted by q1
implicit none
include 'lib/TensorReduction/Include/types.f'
include 'lib/TensorReduction/Include/TRydef.f'
integer:: n1,ep
complex(dp):: F0(-2:0),F1(y1max,-2:0),F1a(y1max,-2:0)
real(dp):: q1(4)
do ep=-2,0
do n1=1,4
F1a(n1,ep)=F1(n1,ep)-q1(n1)*F0(ep)
enddo
enddo
return
end