Subtle Body Energy Centers

[Plenum]

in this passage here, the secondary and tertiary physical energy centres are referenced, which as been explored in xise's thread here.

but there is also mention of the 'subtle body energy centres'.

58.3 There is great art in the use of the swung crystal. At this point in your development, you would do well to work with the unpowerful crystals in ascertaining,

not only the physical major energy centers, but also the physical secondary and tertiary energy centers

and then begin to find the corresponding subtle body energy centers.

In this way, you may activate your own inner vision.

are these subtle body energy centres directly overlaid ontop of the physical energy centres - ie the major chakras as we know them?

and I understand that Ra recommends activating one's 'own inner vision' ... but any thoughts from those who have travelled down this road before?

thanks.