string: …allowing organisms to grow to arbitrarily large sizes (Andersen and Beyer 2006; Capitán and Delius 2010; Datta et al. 2011), a death rate that becomes large when organisms are large (Law et al. 2009; Blanchard et al. 2009) or a fixed size spectrum in the range x > a (Benoît and Rochet 2004).