Failed to compute continuum fit for some spectra

(lsst-scipipe-1172c30) [yabe@fe B0]$ cat process_spectra.log 2020-11-09 13:21:23,830 :: INFO :: Running process_spectra 0.14.0 2020-11-09 13:21:23,892 :: INFO :: Loading /gpfs02/work/yabe/pfs/drp/pipe_e2e/regular_processing/pipe1d_results/calibration/linecatalogs/linecatalogamazedvacuum_F1_noHepsilon.txt 2020-11-09 13:21:23,931 :: INFO :: Loading /gpfs02/work/yabe/pfs/drp/pipe_e2e/regular_processing/pipe1d_results/calibration/linecatalogs/linecatalogamazedvacuum_F2_noHepsilon-linemeas.txt 2020-11-09 13:21:23,931 :: INFO :: Loading /gpfs02/work/yabe/pfs/drp/pipe_e2e/regular_processing/pipe1d_results/calibration/templates/BC03_sdss_tremonti21 2020-11-09 13:22:00,255 :: ERROR :: Can't process :   Operator-Linemodel: Failed to compute continuum fit. Negative amplitude detected! aborting...

(lsst-scipipe-1172c30) [yabe@fe B0]$ cat amazed.log Info:  Loaded 21 templates for category galaxy. Info:  Processing context initialization Info:  Continuum estimation on input spectrum: using IrregularSamplingMedian Info:  Continuum estimation - IrregularSamplingMedian - medianKernelWidth = 400.00 Info:  =============================================== Info:  <proc-spc><pfsObject-00000-00000-0,0-0000000000000004-004-0x44b41c65176b07dc.fits> Info:  Processing spc:pfsObject-00000-00000-0,0-0000000000000004-004-0x44b41c65176b07dc.fits (CLambdaRange: 3853.599854-11999.200195:0.800049) Info:  Stellar solve enabled : yes Info:      Processflow - Loading star templates catalog : templates/stars_templates_vlba37_2018 Info:  Loaded 37 templates for category star. Info:  stellar-solve: Loaded (category=star) template count = 37 Info:  Stellar fitting redshift range = [-0.00100, 0.00100], step=0.000050 Info:  Processing stellar fitting Info:  Method parameters: Info:      -overlapThreshold: 1.000 Info:      -component: nocontinuum Info:      -interp: precomputedfinegrid Info:      -IGM extinction: no Info:      -ISM dust-fit: yes Info:      -pdfcombination: bestchi2 Info:      -saveintermediateresults: 0 Info:  Info:  Iterating over 1 tplCategories Info:     trying star (37 templates) Info:  chisquare2solve: Pdfz computation Info:  chisquare2solve: using cstLog = 332733.329288 Info:      chisquare2solve: Pdfz combination - BestChi2 Info:  Found 1 z-candidates Info:  Computing candidates Probabilities Warning:    Deltaz: Deltaz computation failed for half range 5 samples Warning:    Deltaz: Deltaz computation failed for half range 2 samples Error:    Deltaz: Deltaz for candidate 0.000500 couldnt be calculated Info:    Integrating 1 candidates proba. Info:      CPdfCandidateszResult::Compute pdf peaks info (method=direct integration) Info:  Saving stellar fitting results Info:  Chisquare2Solve-result: extracting best redshift from PDF: z=-0.001000 Info:  Chisquare2Solve-result: extracted best model: model=A_uka0v.dat Info:  QSO solve enabled : no Info:  Linemodel parameters: Info:      -linetypefilter: no Info:      -lineforcefilter: no Info:      -fittingmethod: individual Info:      -linewidthtype: combined Info:      -instrumentresolution: 4300.00 Info:      -velocity emission: 200.00 Info:      -velocity absorption: 300.00 Info:      -velocity fit: yes Info:      -nsigmasupport: 8.0 Info:      -em velocity fit min : 10.0 Info:      -em velocity fit max : 400.0 Info:      -em velocity fit step : 20.0 Info:      -abs velocity fit min : 150.0 Info:      -abs velocity fit max : 500.0 Info:      -abs velocity fit step : 50.0 Info:      -man velocity fit dz min : -6.00e-04 Info:      -man velocity fit dz max : 6.00e-04 Info:      -man velocity fit dz step : 1.00e-04 Info:      -rigidity: tplshape Info:        -tplratio_catalog: linecatalogs_tplshapes/linecatalogs_tplshape_ExtendedTemplatesJan2017v3_20170602_B14C_v6_emission Info:        -tplratio_ismfit: no Info:        -tplfit_priors_dirpath: Info:        -tplratio_priors_betaA:  1.000000 Info:        -tplratio_priors_betaTE:  1.000000 Info:        -tplratio_priors_betaZ:  1.000000 Info:      -linemodel offsets_catalog: linecatalogs_offsets/offsetsCatalogs_20170410_m150 Info:      -continuumcomponent: tplfit Info:        -tplfit_ismfit: yes Info:        -tplfit_igmfit: yes Info:        -continuum fit count:  1 Info:        -tplfit_ignorelinesupport: no Info:        -tplfit_secondpass-LC-fitting-method: -1 Info:        -tplfit_priors_dirpath: Info:        -tplfit_priors_betaA:  1.000000 Info:        -tplfit_priors_betaTE:  1.000000 Info:        -tplfit_priors_betaZ:  1.000000 Info:      -continuumreestimation: no Info:      -extremacount: 5 Info:      -extremacount-firstpass B: 0 Info:      -extrema cut proba-threshold: -1 Info:      -first pass: Info:        -largegridstep: 0.001000 Info:        -fittingmethod: individual Info:        -tplratio_ismfit: no Info:        -multiplecontinuumfit_disable: yes Info:      -second pass: Info:        -skip second pass: no Info:        -continuum fit method: retryall Info:      -pdf-stronglinesprior: -1.000000e+00 Info:      -pdf-hapriorstrength: -1.000000e+00 Info:      -pdf-euclidNHaEmittersPriorStrength: -1.000000e+00 Info:      -pdf-modelpriorzStrength: -1.000000e+00 Info:      -pdf-combination: marg Info:      -pdf-margAmpCorrection: no Info:      -save-intermediate-chisquaretplshaperesults: 0 Info:    Operator-Linemodel: FastFitLargeGrid enabled: 1781 redshifts will be calculated on the large grid (1782 initially) Info:    Operator-Linemodel: TemplatesOrthogonalization enabled = 1 Info:    Operator-Linemodel: Templates store prepared. Info:    Operator-Linemodel: sourcesize init to: ss=0.10 Info:    Operator-Linemodel: Tpl-ratios init Info:      CatalogsTplShape - Loading tplshape catalog : linecatalogs_tplshapes/linecatalogs_tplshape_ExtendedTemplatesJan2017v3_20170602_B14C_v6_emission Info:      CatalogsTplShape - Found 13 tplshaped velocities files Info:      CatalogsTplShape - Found 0 tplshaped priors files Info:      CatalogsTplShape - Found 0 tplshaped priorsPz files Info:      CatalogsTplShape - Loaded 13 tplshaped catalogs Info:    Operator-Linemodel: Lambda offsets init Info:      CatalogsOffsets - Loading offsets catalog : linecatalogs_offsets/offsetsCatalogs_20170410_m150 Info:      CatalogsOffsets - Loaded 1 lines offsets catalogs Info:    Operator-Linemodel: initialized Info:    Operator-Linemodel: continuum tpl fitting: sampling:log, step=1.00000e-03, min=1.00000e-02, max=4.99515e+00 Info:    Operator-Linemodel: continuum tpl redshift list n=1785 Info:    Operator-Linemodel: precomputing- with operator = chisquarelog Info:    Operator-Linemodel: tplfit-precompute done in 4.5929e+00 sec Info:    Operator-Linemodel: fitcontinuum_maxCount set to 1 Error:    Operator-Linemodel: Negative amplitude found at z=0.00700: best continuum tpl ssp_100Myr_z008.dat, amplitude = 0.000000e+00 & error = 9.021289e-19