Cali Spread vs Transport

I have attached my latest version below. I still have not located historical
monthly index prices for AECO and PG&E City Gate. However, in lieu of the
index numbers I have dropped in the average historical daily prices for each
month. Please let me know if you think this is sufficient for your
purposes. Also, let me know if you need any other
interpretations/representations of the historical data.

Tyrell