Condition 2. leads to k < 0 {\displaystyle k<0} and especially, k {\displaystyle k} can be chosen on the form k = − 1 / log ⁡ x {\displaystyle k=-1/\log x} with x > 1 {\displaystyle x>1} , which is equivalent to choosing a specific base for the logarithm. The different units of information (bits for the binary logarithm log2, nats for the natural logarithm ln, bans for the decimal logarithm log10 and so on) are constant multiples of each other. For instance, in case of a fair coin toss, heads provides log2(2) = 1 bit of information, which is approximately 0.693 nats or 0.301 decimal digits.