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real*8 function ucalc (atom,level)
c******************************************************************************
c This routine decodes the partition function data. the source
c is the atlas program of kurucz
c******************************************************************************
implicit real*8 (a-h,o-z)
include 'Atmos.com'
include 'Quants.com'
dimension scale(4)
data scale/0.001,0.01,0.1,1.0/
if (level .gt. 500) then
temp = level
else
temp = t(level)
endif
iatom = nint(atom)
ion = nint(10.*(atom - float(iatom)))
j = 4*(iatom-1) + ion + 1
if (ion .eq. 0) then
chix = xchi1(iatom)
elseif (ion .eq. 1) then
chix = xchi2(iatom)
else
chix = xchi3(iatom)
endif
t2000 = chix*2000./11.
it = max0(1,min0(9,idint(temp/t2000-0.5)))
dt = temp/t2000 - float(it) - 0.5
pmin = 1.
i = (it+1)/2
k1 = nudata(i,j)/100000
k2 = nudata(i,j) - k1*100000
k3 = k2/10
kscale = k2 - k3*10
if (mod(it,2) .eq. 0) then
p1 = float(k3)*scale(kscale)
k1 = nudata(i+1,j)/100000
kscale = mod(nudata(i+1,j),10)
p2 = float(k1)*scale(kscale)
else
p1 = float(k1)*scale(kscale)
p2 = float(k3)*scale(kscale)
if (dt .ge. 0.) go to 13
if (kscale .gt. 1.) go to 13
kp1 = p1
if (kp1 .ne. idint(p2+0.5)) go to 13
pmin = kp1
endif
13 ucalc = dmax1(pmin,p1+(p2-p1)*dt)
return
end
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