PYESSENCE - Generalised Coupled Quintessence Linear Perturbation Python
  Code - User Guide
  This paper is a guide to the installation and use of the Python package
PYESSENCE. PYESSENCE is designed to evolve linear perturbations to Coupled
Quintessence models with a arbitrary number of cold dark matter (CDM) fluids
and dark energy (DE) scalar fields as dictated by a given model. The equations
are sufficiently general to allow for more exotic dark matter with a non-zero
equation of state. Several example uses are included in order to demonstrate
typical functionality to the potential user. PYESSENCE is released under an
open source modified BSD license and is available on Bitbucket.
