{
  "seq:chr": "<%= rec.chrom %>" ,
  "seq:pos": <%= rec.pos %> ,
  "seq:ref": "<%= rec.ref %>" ,
  "seq:alt": "<%= rec.alt[0] %>" ,
  "seq:maf": <%= rec.info.maf[0] %> ,
  "dp":      <%= rec.info.dp %> ,
};