...and let's do a hop, skip and a jump, now....from 'eurobond' to 'eurobonds':

https://en.wikipedia.org/wiki/Eurobond

https://en.wikipedia.org/wiki/Eurobonds

and then what is called the 'European sovereign debt crisis'....why 'sovereign' when it surely isn't about 'monarchy'?

https://en.wikipedia.org/wiki/European_debt_crisis

dazzlenation - what is your 'interpolation' of the following graph?