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

The NYISO is reserving hours beginning 02:00 - 03:00, 07:00 - 08:00, 10:00 -
11:00 and 14:00 - 15:00 in the April 24, 2001 Real-Time Market as well as the
following hours per ECA20001006B to verify prices:

PJM: 00:00 - 04:00, 06:00 - 07:00
HQ:  00:00 - 02:00, 04:00, 06:00 - 07:00, 21:00
OH:  00:00 - 02:00, 06:00 - 07:00
NE:  00:00 - 02:00, 06:00 - 07:00

Prices in the April 25, 2001 Day-Ahead Market are correct.