Example with all variables modifiable

---                                                                             
var1:                         # The first variable                              
  - 0.0                                                                         
var2:                         # The second variable                             
  - 0.0                                                                         
var3:                         # The third variable                              
  - 0.0                                                                         
var4:                         # The forth variable                              
  - 10.1                                                                        
var5:                         # The fifth variable                              
  - 10.1                                                                        
var6:                         # The sixth variable                              
  - 10.1                                                                        
var7:                         # The seventh variable                            
  - 0.0                                                                         
var8:                         # The eighth variable                             
  - 0.0