type     quality   material    weight      resp1  resp2   
# data from Elizabeth Kregel
 liquid generic cardboard weight    61.53  60.62
 liquid generic cardboard no.weight 72.97  74.57
 liquid generic paper     weight    32.19  35.14
 liquid generic paper     no.weight 34.91  34.55
 liquid brand   cardboard weight    63.21  65.79
 liquid brand   cardboard no.weight 79.52  82.00
 liquid brand   paper     weight    32.74  34.40
 liquid brand   paper     no.weight 33.64  33.78
 stick  generic cardboard weight    37.42  39.49
 stick  generic cardboard no.weight 34.75  35.82
 stick  generic paper     weight    27.43  28.97
 stick  generic paper     no.weight 27.95  27.45
 stick  brand   cardboard weight    36.37  35.28
 stick  brand   cardboard no.weight 33.29  37.94
 stick  brand   paper     weight    28.14  26.70
 stick  brand   paper     no.weight 29.43  30.08