  This document describes the package CHIRON which includes two libraries,
chiron itself and jbnumlib.
  CHIRON is a set of routines useful for two-loop numerical results in Chiral
Perturbation Theory (ChPT). It includes programs for the needed one- and
two-loop integrals as well as routines to deal with the ChPT parameters. The
present version includes everything needed for the masses, decay constants and
quark-antiquark vacuum-expectation-values. An added routine calculates
consistent values for the masses and decay constants when the pion and kaon
masses are varied. In addition a number of finite volume results are included:
one-loop tadpole integrals, two-loop sunset integrals and the results for
masses and decay constants.
  The numerical routine library jbnumlib contains the numerical routines used
in chiron. Many are to a large extent simple C++ versions of routines in the
CERNLIB numerical library. Notable exceptions are the dilogarithm and the
Jacobi theta function implementations.
  This paper describes what is included in CHIRON v0.50.
