To get bigger plots in dataviewer (i.e. getting the plot window to auto-scale) for both playback and 'real-time' plots, you can now just set up an option in your GRACE environment:

1) In your user directory make a directory called .grace:      mkdir .grace

2) Change to that directory:                                   cd .grace

3) Copy my gracerc file into your directory:                   cp /ligo/home/rana.adhikari/.grace/gracerc.user .

Now, when you restart dataviewer, you will have autoscaling.

BTW, this is described somewhat in CDS Bugzilla #377 from Tobin Fricke, Jim Batch, & Keith Thorne.