tokens: Acknowledgments The authors would like to thank Nuala McCullagh for helpful discussions relating to the evolution of the matter power spectrum, and Violeta Gonzalez-Perez for helpful discussions relating to the evaluation of the Limber equation, for both this work and C16 . WIC and CGL acknowledge financial support and fruitful discussions from the Munich Institute for Astro- and Particle Physics (MIAPP) DFG cluster of excellence ‘Origin and Structure of the Universe’ workshop entitled ‘The Star Formation History of the Universe’, held in Munich in 2015 August. This work was supported by the Science and Technology Facilities Council [ST/K501979/1, ST/L00075X/1]. CMB acknowledges the receipt of a Leverhulme Trust Research Fellowship. This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility ( www.dirac.ac.uk ). This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National E-Infrastructure.
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