In Exodus 26:26, this signifies the power of truth from good, as found in the good of merit, which is the Lord's alone. (Arcana Coelestia 9662)

In Exodus 26:28, this signifies the power of truth looking toward the interiors which are in light and also to the exteriors where truth is obscure. (Arcana Coelestia 9663, 9664)

In Exodus 26:29, this signifies the primary power of good from which all other powers are extended. (Arcana Coelestia 9666)

Bars, as in Lamentations 2:9, signify doctrinal teachings.

(References: Arcana Coelestia 402)