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

The NYISO is reserving hours beginning 07:00-08:00 and 20:00 in the April 23,
2001 Real-Time
Market as well as the following hours per ECA20001006B to verify prices:

PJM: 06:00 - 07:00, 16:00, 20:00, 22:00
HQ:  06:00 - 07:00, 16:00, 20:00, 22:00
OH:  06:00 - 07:00, 16:00, 20:00, 22:00
NE:  06:00 - 07:00, 16:00, 20:00, 22:00

Prices in the April 24, 2001 Day-Ahead Market are correct.