Table 2.

Mean and standard error (SE) of the output temperature in °C for the three curing lights, by time.

Lamp	Time (sec)
	10		20		30		40		50		60
	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
ECCO	35.0a	0.6	39.8d	0.9	41.0g	1.0	42.8j	1.8	42.5m	2.6	42.0o	2.9
GCP	41.3b	1.1	48.0e	0.8	53.3h	0.6	54.0k	1.2	56.0n	1.6	57.3p	2.4
GSK	32.0c	0.0	34.5f	0.3	34.5i	0.7	36.3l	0.5	37.0m	0.6	35.0o	0.4

The number of samples is 12 per exposure time. Different superscript letters show significant statistical differences (the Bonferroni test) between the materials.