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Grapple Y, in April 1958, yielded about three and remains the most powerful British nuclear weapon ever tested.
A final series of four tests, Grapple Z, tested techniques for making bombs immune to by nearby nuclear explosions.
The painting is in the collection of the.
At the time, Gauguin was living with in ; they had a stormy relationship, but it proved to be a productive period for both artists.
The third, Grapple 3, also had a low yield.