SUBROUTINE SCALE2(VMAX,VMIN,SIZE,XMIND,DXD)
C
C     ORIGINAL PROGRAM BY C. E. COHN FOR THE SEL-840, MODIFIED
C     FOR THE PDP-11/34 BY J. MORMAN, SEPT., 1979.
C     MODIFIED BY P. MURPHY, FEB., 1981 FOR INCLUSION IN
C     THE FOURIER DATA ANALYSIS PROGRAM.
C
C     THIS SUBROUTINE CALCULATES SCALING FACTORS: XMIND AND DXD
C     REQUIRED TO SCALE DATA TO A MAXIMUM VALUE BETWEEN 0.0 AND
C     SIZE.  VARIABLES VMAX AND VMIN ARE THE EXTREMA OF THE DATA.
C     SCALING FACTORS ARE CHOSEN TO BE NICE NUMBERS.
C     
      REAL P(8)
      DATA P/1.,2.,3.,4.,5.,6.,7.,8./
      R=VMAX-VMIN
      RS = R/SIZE
      IF(RS.EQ.0.0) RS=1.0
      T = ALOG10 (RS)
      IF (T) 11,12,13
   11 JT = INT(T - 1.)
      GO TO 14
   12 JT = 0
      GO TO 14
   13 JT = T
   14 H = RS/10.**JT
      IF (H - 8.) 1,1,2
    2 JT = JT + 1
      H = H/10.
    1 DO 3 I=1,8
      IF (P(I) - H) 3,4,4
    3 CONTINUE
    4 DXD = P(I)*10.**JT
      SD = SIZE*DXD
      XM = (VMAX+VMIN - SD)/(2.*DXD)
   15 XMIND = AINT(XM)*DXD
      IF (VMIN - XMIND) 8,9,9
    8 XM = XM - 1.
      GO TO 15
    9 IF (VMAX - XMIND - SD) 5,5,6
    6 I = I + 1
      IF (I - 8) 4,4,7
    7 JT = JT + 1
      H = H/10.
      GO TO 1
5     RETURN
      END