Axis types defined in SpecMan4EPR:

T Signal axis, data directly stored.
I Signal axis, absolute Fourier Transform.
I Signal axis, data acquired during pulse sequence and integrated.
Axis A Signal axis, peak-to-peak amplitude.
I Signal axis, RMS.
X,Y,Z Ordinary axis.
S Sum axis.The data along this axis dimension are summed.
P Parameter axis. Size is always equal to 1. Used to set variables before or after the experiment.

Signal axis represent dimensions of experiment that are acquired during the pulse sequence (typically from the fast digitizer). Transient T icon means that full time trace will be stored to memory. Other axis types represent different processing of data. Yellow icon (for example I) represents processing which results in the same length traces. Gray icons (for example Axis A) represent processing with conversion of the whole trace into single value. In a case of I data are integrated. See Scope window for details on setting of integration range. The title of axis is always signal. The trace parameter defines the length of the time trace and shots means shot per loop. The amount of stored points is defined by axis (processing) type, the length of trace (for T axis) and number of triggers see Ppl page.