Representative ind estimate for no-PDF (yellow) study; author preference unknowable. Value -0.47 confirmed against Dahl DEDD ref Mat77 (El-ii_irrig SR -0.47); Dahl cross-check CONFIRMED.
Mchugh, W. M. (1977): "Energy Demand Modeling and Forecasting." Final Report 02/1977, Mathematical Sciences Northwest, Inc., Bellevue, Washington