Channel sounding parameters

Question

Hi, 
 I’m trying to understand the following parameters in the nRF54L15 channel sounding configuration, because their function is not clear to me. I added my questions as comments to the code: 
 Everything i srelated to this: BLE CS specification 
 struct bt_le_cs_create_config_params config_params = {
	// I think T_FCS steps are repeated, but I don't understand what this parameter does and how important it is to set. What exactly does main_mode_repetition control?
	.main_mode_repetition = 0,
	// Does this mean the measurement is repeated 3 times for each channel?
	.channel_map_repetition = 3,
}; 
 And in the other structure: 
 Here I only understand how to set the length of the whole procedure, but:

Where can I set how many events and subevents are used in one procedure?

Is the number of events and subevents always calculated automatically by BLE?

const struct bt_le_cs_set_procedure_parameters_param procedure_params = {
	.config_id = CS_CONFIG_ID,
	// This sets the total procedure length, so 800 * 0.625 ms = 500 ms
	.max_procedure_len = 800,
	// Interval between procedures, 10 = 6.25 ms
	.min_procedure_interval = 10,
	.max_procedure_interval = 30,
	// Here, do these values set the time limits for each subevent? 
	// Does BLE then automatically decide how many subevents fit into the procedure?
	// I assume subevent length (50-60 ms) decides how many subevents will fit, but where can I set the number of events?
	.min_subevent_len = 50000,
	.max_subevent_len = 60000,
}; 
 One last thing I don’t understand - how many RF channels will be used for the channel sounding measurement? Should I set this explicitly, for example by using bt_le_cs_set_valid_chmap_bits , or is the channel map always chosen automatically in the background? 
 
 Example of what I’m trying to achieve:

I set the procedure length to 500 ms.

Under this, there will be 1-N events (I don’t know how many, is this calculated automatically?)

Each event is divided into subevents (length 50-60 ms), and T_FCS steps per subevent will depend on how many fit?, and on the main/sub mode settings. Is this understanding correct?

I understand that my questions may not be easy to understand, but at least a closer explanation would be good. Thank you, Jan