From: andrea spitaleri (
Date: Tue Sep 27 2005 - 04:00:31 CDT

found answer:
/Top/ indicates the default molecule used in the text commands when
nothing is specified for the mol text command. It is also used in some
forms (like Graphics and Animate) to determine certain values. There can
be only one top molecule at a time.

Andrea Spitaleri
Dulbecco Telethon Institute
c/o DIBIT Scientific Institute
Biomolecular NMR, 1B4
Via Olgettina 58
20132 Milano (Italy)
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