SNP Quality Control information. Columns are:

• rs_id : rs_id (or affymetrix_snp_id if no rs_id available)
• affymetrix_snp_id : id for SNP from Affymetrix array definition
• affymetrix_probeset_id : id for probeset from Affymetrix array definition
• chromosome : Numeric chromosome label 1-26; 23=X,24=Y,25=XY,26=MT
• position : Physical position of start of SNP/Indel in b37 coords
• allele1_ref : Allele1 in the genotypes calls, aligned to ref allele
• allele2_alt : Allele2 in the genotypes calls, aligned to alt allele
• strand : Always '+' from Affymetrix array definition
• array : (0/1/2) Presence of SNP on genotyping arrays 0=BiLEVE, 1=Axiom, 2=both
• BATCH_qc : (0/1) For each batch (Batch_b001-b095,UKBiLEVEAX_b1-b11), SNP passed all QC tests (no/yes)
• in_HetMiss : (0/1) SNP was used in the calculation of Heterozygosity and Missingness
• in_Relatedness : (0/1) SNP was used in the calculation of Kinship
• in_PCA : (0/1) SNP was used in the calculation of sample PCA
• PC_loading : PCA snp_loadings PC1-PC40
• in_Phasing_Input : (0/1) SNP was in the input for Phasing

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Alternatively it can be downloaded or viewed using the link: ukb_snp_qc.txt

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ndph.ox.ac.uk/ukb/ukb/auxdata/ukb_snp_qc.txt