Eenergy Balance Model (EBM)

Usage (CUI):
  Draw two figures, solar constant dependence of ice line latitude and global
  mean temperature:
  $ ruby ebm_ctl.rb

  Draw a figure of latitude variation of temperature and energy budget: 
  $ ruby ebm_ctl0.rb

Usage (GUI):
  Draw a figure of solar constant dependence of ice line latitude: 
  $ ruby ebm_gui_ctl.rb

  Draw a figure of latitude variation of temperature and energy budget: 
  $ ruby ebm_gui_ctl0.rb

Requirement:
  * RubyDCL (http://www.gfd-dennou.org/arch/ruby/products/ruby-dcl/)
    * If you use the debian, please install a gphys package.
  * Ruby/Tk
    * If you use the debian, please install a libtcltk-ruby package.