def get_damptime(conf) :  
    """Parse pressure damp from configuration file
     
    Args: 
        conf: Configuration data. 
     
    Returns:      
        dampt1: Pressure damp in processing. 
        dampt2: Pressure damp in post-processing. 
    """
         
    try :          
        damptime=float(conf['Reactor']['damptime'])   
    except :   
        damptime=1.0   
    
    if  damptime>1E-13 : 
        dampt1="*(1-exp(-"+"{:.6E}".format(damptime)+"*t))^2"
        dampt2="*(1-exp(-"+"{:.6E}".format(damptime)+"*timei))^2"
    else : 
        dampt1=""
        dampt2=""
    return dampt1, dampt2