Calc:data? Versus Trace:data - Agilent Technologies 8712ET Programmer's Manual

Trace Data Transfers

CALC:DATA? versus TRACE:DATA?

CALC:DATA? versus TRACE:DATA?
The SCPI command "CALC1:DATA?" is functionally equivalent to the
command "TRACE:DATA? CH1FDATA". The two can be used
interchangeably for trace queries of the formatted measurement data.
The "TRACE:DATA" command is more flexible, allowing you to query
other measurement arrays and to download data to measurement
arrays.
6-12 Programmer's Guide