sherpa> sherpa.regunc.arange = 0
sherpa> sherpa.regunc.min=[0.1,1.5]
sherpa> sherpa.regunc.max=[1,2.5]

sherpa> sherpa.regunc.arange = 0
sherpa> sherpa.regunc.log = [1,1]
sherpa> sherpa.regunc.sigma = [1,3,5]
sherpa> list_regunc

Parameter   Current         Default                        Description
----------------------------------------------------------------------
expfac            3               3          Expansion factor for grid
arange            0               1              Auto-range: 0(n)/1(y)
min           [0,0]           [0,0]          Minimum values, each axis
max           [0,0]           [0,0]          Maximum values, each axis
log           [1,1]           [0,0]  Log-spacing: 0(n)/1(y), each axis
nloop       [40,40]         [40,40]   Number of grid points, each axis
sigma       [1,3,5]         [1,2,3]      Number of sigma, each contour

sherpa> restore_regunc

sherpa> list_regunc

Parameter   Current         Default                        Description
----------------------------------------------------------------------
expfac            3               3          Expansion factor for grid
arange            1               1              Auto-range: 0(n)/1(y)
min           [0,0]           [0,0]          Minimum values, each axis
max           [0,0]           [0,0]          Maximum values, each axis
log           [0,0]           [0,0]  Log-spacing: 0(n)/1(y), each axis
nloop       [40,40]         [40,40]   Number of grid points, each axis
sigma       [1,2,3]         [1,2,3]      Number of sigma, each contour

sherpa> variable su = sherpa.regunc
sherpa> su.arange = 0
sherpa> su.sigma = [2,4,6]