could someone explain the '$20 in zero coupon bonds per share'.

When the bonds mature in 2012, does thr trust get $20 per unit which would be distributed to unitholders?

More specifically, how are investors valuing this trust?
The last quarterly distribution was 25c. If the trust terminates in 2012, there are 2-3 years of distributions left. So maybe $3 in distributions before the trust terminates. Maybe $4 if NG rises.

Current until price is almost $24. Subtracting $3-4 in remaining distributions, that implies investors are expecting the trust to pay out $20 per unit at termination.

Is that because of this $20 zero coupon bond? Or are the remaining NG assets expected to be worth $20? Or is it $20 for the bonds plus whatever the remaining NG assets are worth thrown in as a bonus?

Please help me understand whether this is worth investing in at this late stage of the trust's life.