To make numbers easier to read, some international scientific committees have recommended
the practice of separating digits into groups of three to the right and to the left of decimal points,
as in 64 325.473 53. No separation is necessary, however, for just four digits, and they are preferably
not separated. For example, either 4138 or 4 138 is acceptable, as is 0.1278 or 0.127 8, with 4138
and 0.1278 preferred.