import numpy as np

### Degrees radians conversion
DEG2RAD = np.pi/180
RAD2DEG = 180./np.pi

### Calories joules conversion
CAL2J = 4.1868
J2CAL = 1./4.1868

### TIP3P water charges
O_CHARGE_tp3 = -0.8340
H_CHARGE_tp3 =  0.4170
