Access to spectrum data

when you see numbers different than 0 as a response to ?k

That works once but what it the radio is then turned off?

Before the radio is turned on
?k
K=0:0:0:0:0:0:0

With the radio on
?k
K=862:511:511:511:869:511:0

After the radio is turned off
?k
K=860:511:511:511:869:511:0

As you can see the data from ?k still looks valid once the radio is turned off.