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Subroutine GDF_TRIM_HEADER changes the rank of an image header. See GDF_READ_HEADER for interpretation of the rank.

subroutine gdf_trim_header(imag,rank,error)
  use gio_dependencies_interfaces
  use gio_interfaces, only : gio_message
  use image_def
  use gbl_message
  ! @ public
  !       Read an image header from the requested file
  type(gildas), intent(inout) :: imag    ! Image structure
  integer(4),   intent(in)    :: rank    ! Requested Rank
  logical,      intent(out)   :: error   ! Error flag

Gildas manager 2014-07-01