Graph does not show colours, nor stats

IMPORT Std;

DataRec := RECORD
    UNSIGNED4       a;
    UNSIGNED4       b;
END;

ds0 := DATASET
    (
        10000,
        TRANSFORM
            (
                DataRec,
                SELF.a := RANDOM() % 1000,
                SELF.b := RANDOM() % 1000 + 1000
            ),
        DISTRIBUTED
    );

ds := NOFOLD(ds0);

blah := Std.DataPatterns.BestRecordStructure
    (
        ds,
        emitTransform := TRUE,
        textOutput := TRUE
    );

OUTPUT(blah, ALL);