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(1) Create a new chart
(2) Load a existing chart
(3) Save the current chart (overwrite)
(4) Clipboard operations: Cut, Copy, Paste
(5) Undo/Redo
(6) Change the mesh size
(7) Mark on/off
(8) Mesh on/off
(9) A real mode on/off (In this case, no mesh/marks will be shown)