digraph G {
  rankdir  = BT
  fontname = "Courier New"
  fontsize = 12

  node [
      fontname = "Courier New"
      fontsize = 12
      shape    = "record"
      width = 0.4
  ]

 lcd_mem_fragment_t -> lcd_t[arrowhead = "empty"]
 lcd_mono_t -> lcd_t[arrowhead = "empty"]
 lcd_mem_t -> lcd_t[arrowhead = "empty"]
 lcd_vgcanvas_t -> lcd_t[arrowhead = "empty"]
 lcd_profile_t -> lcd_t[arrowhead = "empty"]
 lcd_mem_xxx -> lcd_mem_t[arrowhead = "none"]
 lcd_mem_special -> lcd_mem_t[arrowhead = "none"]
}