What is Raster Frequency in 5G?

Hello Experts.

About Raster:

What is Raster Frequency in 5G?
What is Global Frequency Raster?
What is Sync Raster in 5G?
Whether all 3 are same or different?

And how to config the raster?
How many raster list need to be configured, like for example in XCAL drive test log I am getting raster list as below:

[ 2021  Nov  23    15:28:59.649619 ]  [0xB96D] NR5G ML1 Searcher ACQ Config And Response  

Chipset timestamp: 2021-10-12 06:04:23.623190, CFN : 224
Dual Mode Index : 0
SIM Index : 1
Version : 131076
Major.Minor Version : 2.4
trans_id : 0
num_raster : 4
Raster_List
  raster_list[0]
    band : BAND78
    arfcn : 636000
    scs : SSB_30KHZ
    status : E_FAILURE
    num_cell_detect : 0
      Cell_Detect_List
  raster_list[1]
    band : BAND78
    arfcn : 636096
    scs : SSB_30KHZ
    status : E_FAILURE
    num_cell_detect : 0
      Cell_Detect_List
  raster_list[2]
    band : BAND78
    arfcn : 636192
    scs : SSB_30KHZ
    status : E_FAILURE
    num_cell_detect : 0
      Cell_Detect_List
  raster_list[3]
    band : BAND78
    arfcn : 636288
    scs : SSB_30KHZ
    status : E_FAILURE
    num_cell_detect : 0
      Cell_Detect_List