#======================================================================
#                    . I S O P Y C N A L _ T S . G A M M A _ N 
#                    doc: Tue Dec 13 21:50:18 2005
#                    dlm: Mon Dec 19 13:04:15 2005
#                    (c) 2005 A.M. Thurnherr
#                    uE-Info: 27 30 NIL 0 0 72 0 2 4 NIL ofnI
#======================================================================

# HISTORY:
#	Dec 14, 2005: - created
#	Dec 19, 2005: - finalized

# NOTES:
#	- requires %lat/%lon PARAMs

require "$ANTS/libgamma.pl";				# load equation of state

unless (defined($P{ITS})) {
	&antsInfo("using default %ITS=90");
	&antsAddParams(ITS,90);
}
$gamma::temp_scale = $P{ITS};

croak("$0: need %lat/%lon\n")
	unless defined($P{lat}) && defined($P{lon});
croak("$0: need %press\n")
	unless defined($P{press});

sub density($$)
{
	my($S,$T) = @_;
	my($gamma) = gamma::gamma_n($S,$T,$P{press},$P{lat},$P{lon});
	return $gamma > 0 ? $gamma : undef;
}

1;