code: def time_gas(self):
      x = np.linspace(0, 3, 5)
      y = np.empty((2, x.size))
      y[0] = 0.5
      y[1] = -0.5
      solve_bvp(self.fun_gas, self.bc_gas, x, y, tol=self.TOL)
  
imports: import numpy
  from .common import Benchmark, safe_import
  from scipy.integrate import quad, cumulative_simpson
label_desc: Use image node_id 9 for calling the SolveBVP obj's underlying member method code with example usage: obj.time_gas() without return types