Loaded 1030015 SNPs from '/tmp/BMI_munged.sumstats.gz' after merging with LD scores
  Read M = 1264873 from .l2.M_5_50 files
Using two-step estimator with cutoff at 30.
Total Observed scale h2: 0.2032 (0.0055)
Lambda GC: 2.7674
Mean Chi^2: 3.9478
Intercept: 1.0972 (0.0193)
Ratio: 0.0330 (0.0065)