Before using the C code for evaluating VP-function
please make sure that you
1. create a new directory to store c codes, for example, <path-to-C_library>.
2. copy the C codes {VP.h, VP.c, vp0.c} to <path-to-C_library>.
3. export a new environment variable to where you store c codes. Let us call the name of a new environment variable as <clib>.
Please replace <clib> to any name you would like
Suppose we store the codes in <path-to-C_library>, we simply add this line

	export <clib> = "<path-to-C_library folder>"

to ~/.bashrc file and source it.
4. also, do not forget to change <clib> in extlib1.mdl to the name of new variable you choose.
5. add the model to CalCHEP
6. enjoy exploring our model!

For usage of the model with micrOMEGAs
7. also, copy VP.h, VP.c, vp0.c to /lib subdirectory inside your working directory 

