metal << EOT

# Input columns:
MARKER ChrPosID
ALLELE Effect_allele Other_allele
EFFECT BETA
STDERRLABEL SE
FREQLABEL EAF
PVALUE P
STRAND Strand
CUSTOMVARIABLE N
LABEL N AS N

# Metal Options:
SCHEME STDERR
WEIGHT N
USESTRAND ON
AVERAGEFREQ ON
MINMAXFREQ ON
VERBOSE OFF

GENOMICCONTROL ON

PROCESS /path2cleanedfiles/CLEANED.GWA.file.1.txt.gz
PROCESS /path2cleanedfiles/CLEANED.GWA.file.2.txt.gz
PROCESS /path2cleanedfiles/CLEANED.GWA.file.3.txt.gz
# ... 
PROCESS /path2cleanedfiles/CLEANED.GWA.file.N.txt.gz

OUTFILE GWA_metal_result .TBL
ANALYZE HETEROGENEITY

QUIT
EOT