m_securitylevel

Type: short

Default: 0         This variable must contain the security level code for PDF 417 and Aztec barcodes.

Allowed values   0-8 for PDF417
0-99 for Aztec Normal Mode
1-4 (layers) for Aztec Compact mode
1-32 (layers) for Aztec Full range mode

Note that the higher the value of the security level the larger will be the barcode. This value is ignored for Aztec Runes.

More:

m_start mode