Adjusts cpp test

test.cpp

@@ -4,7 +4,7 @@
 #include <iostream>
 
 int main(){
-  std::fstream lisfile("LIS.txt");
+  std::fstream lisfile("Vittino_et_al_e-_LIS.txt");
   double tmp1;
   double tmp2;
   Heliosphere h; //define an object of the class to modulate the interstellar spectrum