I just wanted to express the Normalized part of the magnitude axis label using the Normalized function. True,Normalized will just find a factor that is applied to all numbers, and one just has to pick the right norm. Here is an example of how to scale a list of non-negative random numbers such that the maximum is 1 after normalization:
In[1]:= mag = RandomReal[{0, 100}, {10}];
In[2]:= Max[mag]
Out[2]= 99.6271
In[3]:= magNormalized = Normalize[mag, Norm[#, \[Infinity]] &];
In[4]:= Max[magNormalized]
Out[4]= 1.
The reason for using Normalized is to make the intention clear, but there are also situations where it is convenient to use Normalized since the data (in this case mag) does not have to be repeated. In the end, the result is the same as:
magNormalized = (1 / Norm[mag, \[Infinity]]) mag;
