C ++********************************************************************
C                                                                      *
C                                                                      *
C                                                                      *
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C                                                                      *
C                                                                      *
C                                                                      *
C  PURPOSE:                                                            *
C                                                                      *
C  PARAMETERS:                                                         *
C                                                                      *
C        0         2         3         4         5         6         7 *
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C***********************************************************************

	SUBROUTINE  NRMS(Q,LS,NSAM,NROW,NSLICE,SIGO)
	DIMENSION  Q(LS,NROW,NSLICE)
	DOUBLE PRECISION  AV,SIG,FNALL
	SIG=0.0D0
	AV=0.0D0
c$omp parallel do private(i,j,k),reduction(+:av,sig)
	DO    K=1,NSLICE
           DO    J=1,NROW
	      DO    I=1,NSAM
	         AV=AV+Q(I,J,K)
	         SIG=SIG+Q(I,J,K)*DBLE(Q(I,J,K))
	      ENDDO
           ENDDO
	ENDDO
	FNALL=FLOAT(NSAM)*FLOAT(NROW)*FLOAT(NSLICE)
	SIGO=DSQRT((SIG-AV*AV/FNALL)/(FNALL-1.0))
	END