covsyst_FF.C:
=============
ROOT macro to construct the total systematic 195x195 covariance matrix for
the 3 KLOE pion form factor measurements KLOE08, KLOE10, KLOE12 from the
individual systematic contributions.

In the SystematicSources_FF/-directory, invoke "root" and then do:

.L covsyst_FF.C
PionFF()

This will produce a TH2D-root-histogram "hSyst" which contains the total
systematic covariance matrix. It will also output a "KLOE_syst_pionFF.dat"-file
of the covariance matrix.