Plots the estimated intervention variances.
plotInterventionVars(estIntVars, trueIntVars = NULL, scales_facet = "free")A (Gxp)-dimensional matrix with the estimated intervention
variances returned by backShift (as varianceEnv).
G is the number of unique environments, p is the number of variables.
A (Gxp)-dimensional matrix with the true intervention variances if these are known (for simulations). By default this paramter is set to NULL.
scales argument passed to ggplot's facet_wrap