matplot.axis() range question

When I run the script below, the range tuple is

[0.0, 1.0, 0.0, 1.0]

but the data has an actual range more like [ 0, 6.8, 0, 1], the plot
looks correct, which is good, but the range tuple is wrong. It seems
to work fine with simple data examples but breaks with this data..

This is with Matplotlib v0.54.2

thanks,
S

#!/usr/bin/env python
import matplotlib
matplotlib.use( 'Agg' )
from matplotlib.matlab import *

x = [0.010331810701842871, 0.021066657441595242, 0.030855574358625324,
     0.040250726568746162, 0.050644838316290561, 0.06189415611955508,
     0.07125403603817515, 0.081941196069626396, 0.090571411794129267,
     0.10290686247291918, 0.11444331944589031, 0.1236257225395061,
     0.13473835780826723, 0.14381271569968049, 0.15290481341399415,
     0.16191929992110601, 0.17121682383712447, 0.18154558306766691,
     0.19166699839060464, 0.20041014147521002, 0.21840114667773247,
     0.22475368329468168, 0.23712042657177207, 0.24150561679187502,
     0.25777416395085717, 0.26370159485599637, 0.27115042730497135,
     0.28646842404763118, 0.2945605476107212, 0.3014844847904839,
     0.32090649437954005, 0.33474756188146532, 0.3463087158021369,
     0.35384920060301411, 0.36174596447259966, 0.37111350597671988,
     0.38500936142234621, 0.39310145975693639, 0.40090051408431981,
     0.41178548112097552, 0.42521787270909123, 0.43091391530572509,
     0.44614791389868291, 0.45494374609978966, 0.46186821556645236,
     0.47731590557971521, 0.48107399513220339, 0.4960609645338554,
     0.50293271758231672, 0.51908955994969641, 0.52754726056509504,
     0.538105663764743, 0.54695915774055104, 0.55445022367222696,
     0.56141617038929059, 0.57715732876336034, 0.58331953613820509,
     0.59203627993390995, 0.61018141394423642, 0.62628626881841487,
     0.63192539107874746, 0.6458016862544731, 0.65418149983636986,
     0.66065035611712197, 0.67079601269616063, 0.69003927324831349,
     0.70370643441733494, 0.71145337333441738, 0.72891863943192814,
     0.73620657868200012, 0.7416812708183288, 0.7543094129509258,
     0.76333622772703824, 0.77279502708216075, 0.78113840195825734,
     0.79518542174128759, 0.80283072754516693, 0.81348359069451792,
     0.82483196143668502, 0.83317823230638111, 0.84262635287300347,
     0.85060271704979107, 0.86622649392165829, 0.87378445858363607,
     0.88564073099481444, 0.89462710396172573, 0.90198905417679853,
     0.91225691885603977, 0.92314275233649545, 0.93022796091666171,
     0.94117604421861889, 0.95082199713874538, 0.96289363701352881,
     0.97353750955077867, 0.98050771299924244, 0.99071041335468191,
     1.0]

y = [
    6.8988430562808141, 6.0199122670123426, 5.4877276439939475,
    5.1709425981970805, 4.987254825650786, 4.7417327487085501,
    4.4978934463413314, 4.3250286563667935, 4.2007265350751535,
    4.0541464163597736, 3.9189273603700538, 3.8235472853454988,
    3.7164102779555512, 3.6445717916889664, 3.5480676732338021,
    3.4444786019802529, 3.3625904441222376, 3.2806471950213569,
    3.2011340640076367, 3.1510030907701263, 3.019839474428009,
    2.9822021628354816, 2.9059803156387574, 2.8856395987093051,
    2.7921865811397399, 2.7589612680359936, 2.7174335309498603,
    2.6324831804685527, 2.5900376295500123, 2.5597848772179619,
    2.4655519919224202, 2.4080342023330061, 2.357560958250656,
    2.3276036195316627, 2.2941290050680068, 2.2529601292610253,
    2.2040744982244793, 2.1752627057435507, 2.1490323132220679,
    2.1143606533996637, 2.0692410113398481, 2.0505144863177676,
    2.0051930431043892, 1.9783735967494613, 1.9567455423743982,
    1.9117142836414112, 1.9015246184270749, 1.8570312324545144,
    1.8373286819197756, 1.7930616898324281, 1.7698772818526114,
    1.7416837457846306, 1.7191776401533563, 1.6985358308203811,
    1.6826034910369574, 1.6460157936833077, 1.6312087148596748,
    1.6120311128551963, 1.5717381767713174, 1.5393408540494826,
    1.5277823839983642, 1.4990255085133, 1.482078897585539,
    1.4703127379153567, 1.4503193917059973, 1.414718900022627,
    1.3902791696828953, 1.3773840753041227, 1.3485627887870608,
    1.3368879344126419, 1.3280498048998697, 1.3087099772217325,
    1.2943614279230125, 1.2807173903668139, 1.2682285769430715,
    1.2471152061484074, 1.2357065246849019, 1.2212562025804223,
    1.2059396101922433, 1.19434578885053, 1.1818376806548032,
    1.1710070331197149, 1.150850866654737, 1.141314474700714,
    1.1268033459945574, 1.1160062947810399, 1.1072603628571882,
    1.0952161339218929, 1.082587112669787, 1.0743414397576259,
    1.0620959689501084, 1.0514270580154892, 1.0383865727621933,
    1.0270434782193152, 1.0198775771453545, 1.009374502605529,
    1.0]

plot(x, y )
print axis() # why does this print [0.0, 1.0, 0.0, 1.0]?
savefig('simple_plot')

···

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