Oops it's 4.5ETW per 1ETWG. Which makes the arbitrage opportunity even more obivious.
On my calculations, if ETW=0.16ps, then (assuming that the 4c divvie is included) ETWG's realisable value= 0.76ps.
Compare this to the market price of 0.41ps and buyers in today's market stand to gain a cool 85% in risk arbitrage.