To view the histograms from the root files:
1.  begin a root session
>root
2.  open a browser window
root[0]new TBrowser
3.  Within the browser window in the frame labeled "Contents of ...", 
double-click on the directory where the root file is stored.
4.  In the same frame, double-click on the file name (ie. "good.root").
5.  Use the pull down menu labeled "View" to select "Details".
6.  Plot histograms by double-clicking on histogram names or icons.
7.  To change the style of plot (surf, lego, etc.) do the following:
    a.  Right-click on the 2d histogram and select "DrawPanel".
    b.  In the DrawPanel, left-click on desired option.
    c.  In the DrawPanel, left-click on "Draw".
    [An odd feature of root is that this DrawPanel is no good for the next 
histogram.  One needs to open a new one for each histogram.]
8.  To quit root one can use the appropriate pull down menu from the 
browser or type ".q" at the root prompt in the terminal.
root[1].q