If you want to skip doing the variable by variable removal from the panels, here is the Morse Code.
Top Panel
..- -..- … … … … -..- … … -. .. -. ..- – … … .. -..- — .. -. –
.. … — -. … -. — – … …- -. – … …- -. … . .. –. – .. -. ..- –
. … — – — ..- … . — -. … . … – -..- -.– . – .– —
Key: ABSCISSA to AABCISSS
Remember that you can’t do a columnar transposition with the key because I tried it and at keyed sequence #4 there is no encryption.
So it is:
Sequence one: ABSCISSAABSCISSA
Sequence two: ABSCISSAABSCISSA
Sequence three: ABSCISSAABSCISSA
Sequence four: Straight Morse Code as shown, no encryption.
Sequence five: ABSCISSAABSCISSA
Sequence six: ABSCISSAABSCISSA
Sequence seven: ABSCISSAABSCISSA
Sequence eight: ABSCISSAABSCISSA
Sequence nine: ABSCISSAABSCISSA
Sequence ten: ABSCISSAABSCISSA
With two – – remaining (two dash’s remaining). Those variables are added at the end for a straight decryption.
Bottom Panel:
.–. .–. .–. .–. .–. .-. -… .-. — .-. .–. .-. -.. .-. — — .-. -.. .-.
— — -.-. .- .- –.- .-. .-.. -… -… ..-. .-.. .-. –.- .–. .-. –.- .—
–.- -.- –.. –.. .- .— -.- .-.. .- ..-. -… .–. — –.. ..-. .–. -.- -..
-.- –.. .— -.-. -.. -.- .- -.- -.-. .- .-.
The same rule applies here with no columnar transposition due to decryption interruption at sequence two. The key for this section is PALIMPSEST
Sequence one: PALIMPSESTPALIMPSEST
Sequence two: Straight Morse Code as shown with no decryption.
Sequence three through ten: PALIMPSESTPALIMPSEST
Sequence eleven: Straight Morse Code as shown with no decryption.
Sequence twelve: PALIMPSESTPALIMPSEST
Remaining variables of . . – . – . solve straight to “IC” following the “A” for “AIC” at end.