Simulink

Model {
  Name			  "simple_gain"
  Version		  7.0
  System {
    Name		    "simple_gain"
    Location		    [480, 85, 980, 386]
    Open		    on
    ModelBrowserVisibility  off
    ModelBrowserWidth	    200
    ScreenColor		    "white"
    PaperOrientation	    "landscape"
    PaperPositionMode	    "auto"
    PaperType		    "usletter"
    PaperUnits		    "inches"
    Block {
      BlockType		      Constant
      Name		      "Constant"
      Position		      [25, 100, 55, 130]
      Value		      "1"
    }
    Block {
      BlockType		      Gain
      Name		      "Gain"
      Position		      [100, 100, 130, 130]
      Gain		      "2.5"
    }
    Block {
      BlockType		      Scope
      Name		      "Scope"
      Ports		      [1]
      Position		      [185, 99, 215, 131]
    }
    Line {
      SrcBlock		      "Constant"
      SrcPort		      1
      DstBlock		      "Gain"
      DstPort		      1
    }
    Line {
      SrcBlock		      "Gain"
      SrcPort		      1
      DstBlock		      "Scope"
      DstPort		      1
    }
  }
}