One indication of the importance of replication is found in the 50 or more calls for replication research in the field of second language (L2) research alone (see references for 50 calls and commentaries in Appendix S1 in the Supporting Information online): from Santos (1989) through Polio and Gass 1997 to very recent proposals for specific replication studies, such as Vandergrift and Cross 2017 and even a book-length treatment (Porte, 2012).
1	One	one	NUM	CD	NumForm=Word|NumType=Card	2	nummod	2:nummod	Discourse=explanation-evidence:8->3:1|Entity=(19-abstract-new-cf6-2-sgl
2	indication	indication	NOUN	NN	Number=Sing	9	nsubj:pass	9:nsubj:pass	_
3	of	of	ADP	IN	_	5	case	5:case	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	5:det	Entity=(20-abstract-new-cf8-2-coref
5	importance	importance	NOUN	NN	Number=Sing	2	nmod	2:nmod:of	_
6	of	of	ADP	IN	_	7	case	7:case	_
7	replication	replication	NOUN	NN	Number=Sing	5	nmod	5:nmod:of	Entity=(7-abstract-giv:inact-cf4-1-coref)20)19)
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	aux:pass	9:aux:pass	_
9	found	find	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
10	in	in	ADP	IN	_	15	case	15:case	_
11	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	Entity=(21-abstract-new-cf3-5-coref
12	50	50	NUM	CD	NumForm=Digit|NumType=Card	15	nummod	15:nummod	_
13	or	or	CCONJ	CC	_	14	cc	14:cc	_
14	more	more	ADJ	JJR	Degree=Cmp	12	conj	12:conj:or|15:nummod	_
15	calls	call	NOUN	NNS	Number=Plur	9	obl	9:obl:in	_
16	for	for	ADP	IN	_	18	case	18:case	_
17	replication	replication	NOUN	NN	Number=Sing	18	compound	18:compound	Entity=(22-abstract-new-cf20-2-coref(7-abstract-giv:act-cf4-1-coref)
18	research	research	NOUN	NN	Number=Sing	15	nmod	15:nmod:for	Entity=22)
19	in	in	ADP	IN	_	21	case	21:case	_
20	the	the	DET	DT	Definite=Def|PronType=Art	21	det	21:det	Entity=(2-abstract-giv:inact-cf5-2-coref
21	field	field	NOUN	NN	Number=Sing	18	nmod	18:nmod:in	_
22	of	of	ADP	IN	_	28	case	28:case	_
23	second	second	ADJ	JJ	Degree=Pos|NumType=Ord	24	amod	24:amod	Entity=(3-abstract-giv:inact-cf2-2-coref-Second_language
24	language	language	NOUN	NN	Number=Sing	28	compound	28:compound	Entity=3)
25	(	(	PUNCT	-LRB-	_	26	punct	26:punct	Discourse=restatement-partial:9->8:0|SpaceAfter=No
26	L2	L2	NOUN	NN	Number=Sing	24	appos	24:appos	Entity=(3-abstract-giv:act-cf2-1-appos-Second_language)|SpaceAfter=No
27	)	)	PUNCT	-RRB-	_	26	punct	26:punct	_
28	research	research	NOUN	NN	Number=Sing	21	nmod	21:nmod:of	Discourse=same-unit_m:10->8:1|Entity=2)
29	alone	alone	ADV	RB	Degree=Pos	21	advmod	21:advmod	Entity=21)
30	(	(	PUNCT	-LRB-	_	31	punct	31:punct	Discourse=explanation-evidence:11->8:2|SpaceAfter=No
31	see	see	VERB	VB	VerbForm=Inf	15	dep	15:dep	_
32	references	reference	NOUN	NNS	Number=Plur	31	obj	31:obj	Entity=(23-abstract-new-cf7-1-sgl)
33	for	for	ADP	IN	_	35	case	35:case	_
34	50	50	NUM	CD	NumForm=Digit|NumType=Card	35	nummod	35:nummod	Entity=(21-abstract-giv:act-cf3-2-coref
35	calls	call	NOUN	NNS	Number=Plur	32	nmod	32:nmod:for	Entity=21)
36	and	and	CCONJ	CC	_	37	cc	37:cc	_
37	commentaries	commentary	NOUN	NNS	Number=Plur	35	conj	32:nmod:for|35:conj:and	Entity=(24-abstract-new-cf21-1-coref)
38	in	in	ADP	IN	_	40	case	40:case	_
39	Appendix	Appendix	PROPN	NNP	Number=Sing	40	compound	40:compound	Entity=(25-abstract-new-cf16-1,2-sgl
40	S1	S1	PROPN	NNP	Number=Sing	31	obl	31:obl:in	_
41	in	in	ADP	IN	_	44	case	44:case	_
42	the	the	DET	DT	Definite=Def|PronType=Art	44	det	44:det	Entity=(26-abstract-new-cf9-3-sgl
43	Supporting	support	VERB	VBG	VerbForm=Ger	44	amod	44:amod	_
44	Information	information	NOUN	NN	Number=Sing	40	nmod	40:nmod:in	_
45	online	online	ADV	RB	Degree=Pos	44	advmod	44:advmod	Entity=26)25)|SpaceAfter=No
46	)	)	PUNCT	-RRB-	_	31	punct	31:punct	SpaceAfter=No
47	:	:	PUNCT	:	_	49	punct	49:punct	_
48	from	from	ADP	IN	_	49	case	49:case	Discourse=elaboration-additional:12->8:3
49	Santos	Santos	PROPN	NNP	Number=Sing	15	nmod	15:nmod:from	Entity=(27-abstract-new-cf17-1-sgl(28-person-new-cf10-1-sgl)
50	(	(	PUNCT	-LRB-	_	51	punct	51:punct	SpaceAfter=No
51	1989	1989	NUM	CD	NumForm=Digit|NumType=Card	49	nmod:tmod	49:nmod:tmod	Entity=(29-time-new-cf24-1-sgl)27)|SpaceAfter=No|XML=<date when:::"1989"></date>
52	)	)	PUNCT	-RRB-	_	51	punct	51:punct	_
53	through	through	ADP	IN	_	54	case	54:case	_
54	Polio	Polio	PROPN	NNP	Number=Sing	15	nmod	15:nmod:through	Entity=(30-abstract-new-cf18-1,3-sgl(31-person-new-cf11-1-sgl-Charlene_Polio)
55	and	and	CCONJ	CC	_	56	cc	56:cc	_
56	Gass	Gass	PROPN	NNP	Number=Sing	54	conj	15:nmod:through|54:conj:and	Entity=(32-person-new-cf12-1-sgl-Susan_Gass)
57	1997	1997	NUM	CD	NumForm=Digit|NumType=Card	54	nmod:tmod	54:nmod:tmod	Entity=(33-time-new-cf25-1-sgl)30)|XML=<date when:::"1997"></date>
58	to	to	ADP	IN	_	61	case	61:case	_
59	very	very	ADV	RB	_	60	advmod	60:advmod	Entity=(34-abstract-new-cf22-3,13,21-sgl
60	recent	recent	ADJ	JJ	Degree=Pos	61	amod	61:amod	_
61	proposals	proposal	NOUN	NNS	Number=Plur	15	nmod	15:nmod:to	_
62	for	for	ADP	IN	_	65	case	65:case	_
63	specific	specific	ADJ	JJ	Degree=Pos	65	amod	65:amod	Entity=(35-abstract-new-cf23-3-sgl
64	replication	replication	NOUN	NN	Number=Sing	65	compound	65:compound	Entity=(7-abstract-giv:act-cf4-1-coref)
65	studies	study	NOUN	NNS	Number=Plur	61	nmod	61:nmod:for	Entity=35)|SpaceAfter=No
66	,	,	PUNCT	,	_	69	punct	69:punct	_
67	such	such	ADJ	JJ	Degree=Pos	69	case	69:case	_
68	as	as	ADP	IN	_	67	fixed	67:fixed	_
69	Vandergrift	Vandergrift	PROPN	NNP	Number=Sing	65	nmod	65:nmod:such_as	Entity=(36-abstract-new-cf19-1,3-sgl(37-person-new-cf13-1-sgl)
70	and	and	CCONJ	CC	_	71	cc	71:cc	_
71	Cross	Cross	PROPN	NNP	Number=Sing	69	conj	65:nmod:such_as|69:conj:and	Entity=(38-person-new-cf14-1-sgl)
72	2017	2017	NUM	CD	NumForm=Digit|NumType=Card	69	nmod:tmod	69:nmod:tmod	Entity=(39-time-new-cf26-1-coref)36)|XML=<date when:::"2017"></date>
73	and	and	CCONJ	CC	_	79	cc	79:cc	_
74	even	even	ADV	RB	_	79	advmod	79:advmod	_
75	a	a	DET	DT	Definite=Ind|PronType=Art	79	det	79:det	Entity=(40-abstract-new-cf1-5-coref
76	book	book	NOUN	NN	Number=Sing	78	compound	78:compound	SpaceAfter=No|XML=<w>
77	-	-	PUNCT	HYPH	_	76	punct	76:punct	SpaceAfter=No
78	length	length	NOUN	NN	Number=Sing	79	compound	79:compound	XML=</w>
79	treatment	treatment	NOUN	NN	Number=Sing	61	conj	15:nmod:to|61:conj:and	Entity=40)
80	(	(	PUNCT	-LRB-	_	81	punct	81:punct	Discourse=explanation-evidence:13->12:0|SpaceAfter=No
81	Porte	Porte	PROPN	NNP	Number=Sing	79	dep	79:dep	Entity=(40-abstract-giv:act-cf1-1-coref(41-person-new-cf15-1-coref)|SpaceAfter=No
82	,	,	PUNCT	,	_	83	punct	83:punct	_
83	2012	2012	NUM	CD	NumForm=Digit|NumType=Card	81	nmod:tmod	81:nmod:tmod	Entity=(42-time-new-cf27-1-coref)40)|SpaceAfter=No|XML=<date when:::"2012"></date>
84	)	)	PUNCT	-RRB-	_	81	punct	81:punct	Entity=34)|SpaceAfter=No
85	.	.	PUNCT	.	_	9	punct	9:punct	_
