jsavitt@nyiso.com writes to the NYISO_TECH_EXCHANGE Discussion List:

The NYISO is reserving hours-beginning 3, 4, 8-14, 16, 18, and 19 in the 20
April 2001 real-time market to verify prices.
Prices for the 21 April 2001 Day-Ahead market are correct
Pursuant to ECA-B the following hours at the following external proxy buses 
are
reserved:
PJM, OH, HQ:  0-2, 18-20, 22
NE:  0-2, 18-20, 22, 23