Grobid seems to keep skipping entire columns

[efosaenomayo]

Operating System and architecture (arm64, amd64, x86, etc.)

Ubuntu 24.04.2 LTS, x86

What is your Java version

openjdk 11.0.26

Log and information

I'm attempting to process PDFs with GROBID, but keep encountering this issue where entire columns are skipped.

The original PDF file: 6H-SiC JFETs for 450 °C Differential Sensing Applications.pdf

First Page of PDF:

The highlighted section is missing from XML output. And the figure afterwards is missing too.

### TEI XML file output:

Further information

No response

[lfoppiano]

@efosaenomayo the introduction column is wrongly classified as header, and then discarded. We need to add papers like this as training data for the segmentation model.

Index	Terms-Differential	index	I	In	Ind	Inde	BLOCKSTART	PAGEIN	SAMEFONT	SAMEFONTSIZE	1	1	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	3	-,--	4	8	0	0	0	0	1	<header>
tronics,	junction	tronics,	t	tr	tro	tron	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	1	1	NOCAPS	NODIGIT	0	0	0	0	0	0	0	0	0	3	,-(),	5	10	0	0	0	0	1	<header>
integrated	circuit	integrated	i	in	int	inte	BLOCKEND	PAGEIN	SAMEFONT	SAMEFONTSIZE	1	1	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	3	().	3	3	0	0	0	0	1	<header>
I.	INTRODUCTION	i.	I	I.	I.	I.	BLOCKSTART	PAGEIN	NEWFONT	HIGHERFONT	0	0	ALLCAP	NODIGIT	0	0	0	0	0	0	0	0	0	4	.	1	10	0	0	0	0	1	<header>
H	IGH-TEMPERATURE	h	H	H	H	H	BLOCKSTART	PAGEIN	NEWFONT	HIGHERFONT	1	0	ALLCAP	NODIGIT	1	0	0	0	0	0	0	0	0	4	-	1	10	0	0	0	0	1	<header>
propulsion,	power	propulsion,	p	pr	pro	prop	BLOCKSTART	PAGEIN	NEWFONT	LOWERFONT	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	,,-	3	7	0	0	0	0	1	<header>
ration,	for	ration,	r	ra	rat	rati	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	,,,	3	10	0	0	0	0	1	<header>
emissions,	and	emissions,	e	em	emi	emis	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	,.	2	9	0	0	0	0	1	<header>
sensing	systems	sensing	s	se	sen	sens	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	•[]	3	9	0	0	0	0	1	<header>
not	only	not	n	no	not	not	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	,	1	9	0	0	0	0	1	<header>
of	current	of	o	of	of	of	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	no	0	9	0	0	0	0	1	<header>
provisions.	Reliability	provisions.	p	pr	pro	prov	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	.	1	8	0	0	0	0	1	<header>
weight	of	weight	w	we	wei	weig	BLOCKEND	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	4	no	0	9	0	0	0	0	1	<header>
Manuscript	received	manuscript	M	Ma	Man	Manu	BLOCKSTART	PAGEIN	SAMEFONT	LOWERFONT	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	,;,.	4	8	0	0	0	0	1	<header>
published	June	published	p	pu	pub	publ	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	5	,;,.	4	9	0	0	0	0	1	<header>
was	supported	was	w	wa	was	was	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	5	no	0	8	0	0	0	0	1	<header>
Award	NBCH1050002.	award	A	Aw	Awa	Awar	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	....	4	5	0	0	0	0	1	<header>
A.	C.	a.	A	A.	A.	A.	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	ALLCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	..,	3	9	0	0	0	0	1	<header>
Electric	Global	electric	E	El	Ele	Elec	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	,,.	3	6	0	0	0	0	1	<header>
X.	Fu	x.	X	X.	X.	X.	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	ALLCAP	NODIGIT	0	0	0	0	0	0	0	0	0	5	.,	2	8	0	0	0	0	1	<header>
Louisville,	Louisville,	louisville,	L	Lo	Lou	Loui	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	0	0	0	0	0	0	0	5	,,.	3	4	0	0	0	0	1	<header>
C.	Anupongongarch	c.	C	C.	C.	C.	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	ALLCAP	NODIGIT	0	0	0	0	0	0	0	0	0	5	.,,.	4	8	0	0	0	0	1	<header>
M.	Mehregany	m.	M	M.	M.	M.	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	ALLCAP	NODIGIT	0	0	0	0	0	0	0	0	0	5	...-	4	8	0	0	0	0	1	<header>
sity,	Cleveland,	sity,	s	si	sit	sity	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	0	0	0	0	0	0	0	5	,,.	3	3	0	0	0	0	1	<header>
Color	versions	color	C	Co	Col	Colo	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	no	0	10	0	0	0	0	1	<header>
at	http://ieeexplore.ieee.org.	at	a	at	at	at	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	5	://...	6	3	0	0	0	0	1	<header>
Digital	Object	digital	D	Di	Dig	Digi	BLOCKEND	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	5	./..	4	6	0	0	0	0	1	<header>
Fig.	1.	fig.	F	Fi	Fig	Fig.	BLOCKSTART	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	INITCAP	NODIGIT	0	0	1	0	0	0	0	0	0	7	...	3	10	1	1	0	0	1	I-<body>
electronics,	and	electronics,	e	el	ele	elec	BLOCKSTART	PAGEIN	SAMEFONT	HIGHERFONT	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	7	,	1	9	1	1	0	0	1	<body>
the	signals	the	t	th	the	the	BLOCKIN	PAGEIN	SAMEFONT	SAMEFONTSIZE	0	0	NOCAPS	NODIGIT	0	0	1	0	0	0	0	0	0	7	no	0	10	1	1	0	0	1	<body>

Will work on this during the next months, as part of the next grobid release, If you have examples with similar problems, feel free to attach the in this issue.

Update: I've checked the licence of this article and we cannot include in our open source training dataset. Allowed articles have to be CC-BY either written inside the pdf document or in the publsher's page.