problem with leasqr fitting

Hello,

I am trying to perform a fitting and I am obtaining the following results
pfit1 =

   375.11773
    83.26345
     0.29860

kvg = 1
iter =  3
corp1 =

    NA    NA    NA
    NA    NA    NA
    NA    NA    NA

covp1 =

    NA    NA    NA
    NA    NA    NA
    NA    NA    NA

I attach the data for consideration

thanks

datam= xlsread ('data1.xlsx');

temp=datam(1:173,1)+273;
[intensity, lambda] = regdatasmooth (temp, datam(1:173,2));

k=8.6170e-005;

[pks, loc]=findpeaks (intensity,"DoubleSided");

imaxi=intensity(loc(index=find(pks==max(pks))));
tmaxi=temp(loc(index=find(pks==max(pks))));


eacti1= 0.2;

parTLi1 = [tmaxi,imaxi,eacti1];

F1=@(temp,parTLi1)(imaxi*exp(1+parTLi1(3)./(k*temp).*(temp-parTLi1(1))/parTLi1(1)-temp.^2/parTLi1(1).^2*(1-(2*k*parTLi1(1))/parTLi1(3)).*exp(parTLi1(3)./(k*temp).*(temp-parTLi1(1))/parTLi1(1))-(2*k*parTLi1(1)/parTLi1(3))));

wt_tl=ones(size(temp));
iter_tl=800;
tol_tl=0.1;
dFdp_tl="dfdp";
dp_tl=0.0001*ones(size(parTLi1));

%tolerance
tmax_max=tmaxi+2;
tmax_min=tmaxi-2;
imax_max=imaxi+100;
imax_min=imaxi-100;
eact_max=1.3;
eact_min=0.5;

bounds= [tmax_min,tmax_max; imax_min, imax_max; eact_min,eact_max];


f2=0;

[f2, pfit1, kvg, iter, corp1, covp1, covr1,r2] = leasqr (temp, intensity,
parTLi1, F1,tol_tl, iter_tl,wt_tl, dp_tl, dFdp_tl, bounds)

data1.xlsx <https://octave.1599824.n4.nabble.com/file/t372706/data1.xlsx>  




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