Brainteaser 1688: Sunday paper

From The Sunday Times, 22nd January 1995 [link]

As usual, in this letters-for-digits puzzle different digits have consistently been replaced by different letters:

Each letter in the second row is the sum of its two nearest letters in the row above.

What is the value of READER?

This puzzle was included in the book Brainteasers (2002, edited by Victor Bryant). The puzzle text above is taken from the book.