(DELAYFILE
  (SDFVERSION "3.0")
  (DESIGN "test")
  (VOLTAGE 3.70:3.30:3.00)
  (PROCESS "fast:typ:slow")
  (TEMPERATURE 25.00:55.00:100.00)
  (TIMESCALE 1ns)

  (CELL
    (CELLTYPE "my_buf")
    (INSTANCE dut)
    (DELAY
      (ABSOLUTE
      (IOPATH a z (1.0:2.0:3.0) (2.0:3.0:4.0))
      )
    )
  )
)