Backward Stretch
Forward Stretch
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© D C Cello Studio 2012
Detailed Diagrams for Extended First Position
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© D C Cello Studio 2012
The Cello Companion 
These are excellent! Thank you. If I may point out one small error. In the backward stretch (or extension as we’d call it in the US) diagram, the red string label is wrong for the C-string. The label says C String, and the notes are on the C-string, but the highlight color is on the G.
Hah! I knew I’d miss one of those string labels! Many thanks for alerting me to that – I’ll be amending it very soon – and for your feedback.