EXPLAIN output explanation requested

Hello all,

I have an EXPLAIN statement that gives me output I understand,
but on the other hand I don't...

tium=# explain select codec1, phonetype from phone;
QUERY PLAN
------------------------------------------------------------
Seq Scan on phone (cost=0.00..85882.58 rows=658 width=11)
(1 row)

This is a table with 658 rows. Queries are indeed very
slow. How is the query plan computed? What does the 85882 value
mean?

Thanks,
Ron

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