 = "TweakedSST"&gt;&gt;&gt; sstdict["title"] = "Tweaked subset of SST"&gt;&gt;&gt; print sstdict["data"][0:3,0:14:5,0,0,0,0][[ 1.18630772e+01 1.84438629e+01 1.00000002e+20] [ 1.18327265e+01 1.82615910e+01 1.00000002e+20] [ 1.14976921e+01 1.81365108e+01 1.00000002e+20]]&gt;&gt;&gt; print pyferret.metastr(sstdict)name: TweakedSSTtitle: Tweaked subset of SSTdata_unit: Deg Cmissing_value: 1e+20 ...(output snipped)...</pre><p>Notice that due to floating-point precision, the missing value of -1.0E+34 is actually 