[amibroker] Newbie question on functions: Graph vs Plot

[h3po]

I see there are two ways in AFL to plot the contents of an array, e.g:

Plot( MyArray, "Some indicator", colorBlue ); 

or

Graph1Color=29;
Graph1 = MyArray;

When should one use 'Graph' and when should one use 'Plot'? (I can find 
no information in the help menu on 'graph1').

Any help appreciated,
Ole