PV as a leading control variable in Var.

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Diagnostics required for the PV scheme
Diagnostic description	Streamfunction-based control variables			PV-based control variables		Other variables
	psi	^Ap	p-^Ap	psi_B	p_U	chi
1. Variance or weight of field (projected to large horiz./small vert. scales).	To do	To do	To do	To do	To do	n/a
2. Variance or weight of field (projected to small horiz./large vert. scales).	To do	To do	To do	To do	To do	n/a
3. Variance or weight of total field.	To do	To do	To do	To do	To do	To do
4. Vertical error correlations with level X as a function of wavenumber.	To do	To do	To do	To do	To do	To do
5. Vertical error correlations with level X as a function of latitude.	To do	To do	To do	To do	To do	To do
6. Horizontal error correlations with level X as a function of latitude.	To do	To do	To do	To do	To do	To do