The modem image is included in the zip as NON-HLOS.bin, several other files also have different names. Just open the partition.txt file, every line corresponds to one partition slot and the filename comes after the comma:
modem_a,NON-HLOS.bin
modem_b,NON-HLOS.bin
fsc,
ssd,
sbl1_a,sbl1.mbn
sbl1_b,sbl1.mbn
...
The partitions without a corresponding filename should probably be kept and not flashed.
You can also have a look at partition.xml which contains the some more information about the partitions.