Keyword Analysis & Research: what does error 503 mean

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does error 503 mean	1.99	0.6	3038	5	24
what	0.37	0.6	932	13	4
does	1.1	0.1	8778	50	4
error	0.51	1	1123	9	5
503	1.58	0.6	4312	47	3
mean	1.91	0.6	8401	54	4

Keyword	CPC	PCC	Volume	Score
what does error 503 mean	0.15	0.9	7876	60