The three tables below display the same information: the sex, body weight and head weight (in kg) for 6 cats. Which one of the statements below is true? 

CATS1

    sex body_weight head_weight

     F         2.1         7.0
     F         1.9         7.4
     F         2.4         9.5
     M         3.3        10.4
     M         3.0        10.6
     M         3.1        11.6

CATS2

   sex    variable value
    F body_weight   2.1
    F body_weight   1.9
    F body_weight   2.4
    M body_weight   3.3
    M body_weight   3.0
    M body_weight   3.1
    F head_weight   7.0
    F head_weight   7.4
    F head_weight   9.5
    M head_weight  10.4
    M head_weight  10.6
    M head_weight  11.6

CATS3

F.body_weight F.head_weight M.body_weight M.head_weigh
        2.1           7.0           3.3          10.4
        1.9           7.4           3.0          10.6
        2.4           9.5           3.1          11.6