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

The NYISO is reserving hours beginning 00:00, 01:00, 13:00, and 14:00 in the
April 27, 2001 Real-Time Market as well as the following hours per 
ECA20001006B
to verify prices:

PJM: 05:00 and 23:00
HQ:  05:00 and 23:00
OH:  05:00 and 23:00
NE:  05:00 and 23:00

Prices in the April 28, 2001 Day-Ahead Market are correct.

This e-mail information is a copy of the official posting which can be found 
at
the following address on our website:
http://mis.nyiso.com/public/htm/OperMessages/CurrentOperMessages.htm#mm