Raising the query on an external client's behalf:
Client is seeking assistance on how to pull the Swaption Volatility as seen in this page Home > Fixed Income > Interest Rate Derivatives > Swaptions
Eikon link: http://emea1.apps.cp.thomsonreuters.com/Explorer/GuideDefault.aspx?s=GFI40+AL+3&st=Menu+G+C&context=OV
using Excel API.