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I want to plot the following function with different values of the parameter $b$:

 a = -0.1 Sqrt[0.001^2 + b^2];

 M[t_] := NIntegrate[10w E^(-w/50)((1-Cos[(w+a)t])/(w+a)^2),{w,0,-a,∞}, 
 MaxRecursion -> 100, AccuracyGoal -> 10, Method -> "PrincipalValue"]

 Plot[M[t],{t,0,1000}]

How can I code different plots for different values of parameter $b$ in a single plot?

Note: My actual code is pretty bigger than this. So I cannot define a new series of variables and functions for each value of the parameter and then plot them simultaneously.

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    $\begingroup$ M[t_, b_] := With[{a = -0.1 Sqrt[0.001^2 + b^2]}, (* stuff *)], then use Table[] within Plot[]. $\endgroup$ – J. M. is away♦ Jul 29 '16 at 6:06
  • $\begingroup$ @J.M Thanks man. But can you elaborate on that? $\endgroup$ – Farhad Jul 29 '16 at 6:30
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Following J.M.'s comment (his credit)

M[t_, b_] :=  With[{a = -0.1 Sqrt[0.001^2 + b^2]}, 
  NIntegrate[10 w E^(-w/50) ((1 - Cos[(w + a) t])/(w + a)^2), {w, 
    0, -a, ∞}, MaxRecursion -> 100, AccuracyGoal -> 10, 
   Method -> "PrincipalValue"]]

Then 

 Plot[ Table[M[t, b], {b, 1, 2}]//Evaluate, {t, 0, 1}]

Mathematica graphics

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    $\begingroup$ Suggest you put Evaluate round the table to see the curves in different colours $\endgroup$ – mikado Jul 29 '16 at 8:06
  • $\begingroup$ its done thanks! $\endgroup$ – chris Jul 29 '16 at 8:17
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Check this formalism. It works.

mList = {1, 3, 4, 6};

Plot[Table[m x, {m, mList}] // Evaluate, {x, 0, 10}, 
PlotLegends -> mList]
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